Merge main into multi-project

benchmarks/src/main/java/org/elasticsearch/benchmark/vector/VectorScorerBenchmark.java

@@ -83,6 +83,8 @@ public class VectorScorerBenchmark {
 
     RandomVectorScorer luceneDotScorerQuery;
     RandomVectorScorer nativeDotScorerQuery;
+    RandomVectorScorer luceneSqrScorerQuery;
+    RandomVectorScorer nativeSqrScorerQuery;
 
     @Setup
     public void setup() throws IOException {
@@ -130,6 +132,8 @@ public class VectorScorerBenchmark {
         }
         luceneDotScorerQuery = luceneScorer(values, VectorSimilarityFunction.DOT_PRODUCT, queryVec);
         nativeDotScorerQuery = factory.getInt7SQVectorScorer(VectorSimilarityFunction.DOT_PRODUCT, values, queryVec).get();
+        luceneSqrScorerQuery = luceneScorer(values, VectorSimilarityFunction.EUCLIDEAN, queryVec);
+        nativeSqrScorerQuery = factory.getInt7SQVectorScorer(VectorSimilarityFunction.EUCLIDEAN, values, queryVec).get();
 
         // sanity
         var f1 = dotProductLucene();
@@ -157,6 +161,12 @@ public class VectorScorerBenchmark {
         if (q1 != q2) {
             throw new AssertionError("query: lucene[" + q1 + "] != " + "native[" + q2 + "]");
         }
+
+        var sqr1 = squareDistanceLuceneQuery();
+        var sqr2 = squareDistanceNativeQuery();
+        if (sqr1 != sqr2) {
+            throw new AssertionError("query: lucene[" + q1 + "] != " + "native[" + q2 + "]");
+        }
     }
 
     @TearDown
@@ -217,6 +227,16 @@ public class VectorScorerBenchmark {
         return 1 / (1f + adjustedDistance);
     }
 
+    @Benchmark
+    public float squareDistanceLuceneQuery() throws IOException {
+        return luceneSqrScorerQuery.score(1);
+    }
+
+    @Benchmark
+    public float squareDistanceNativeQuery() throws IOException {
+        return nativeSqrScorerQuery.score(1);
+    }
+
     QuantizedByteVectorValues vectorValues(int dims, int size, IndexInput in, VectorSimilarityFunction sim) throws IOException {
         var sq = new ScalarQuantizer(0.1f, 0.9f, (byte) 7);
         var slice = in.slice("values", 0, in.length());

build-conventions/src/main/java/org/elasticsearch/gradle/internal/conventions/GitInfoPlugin.java

@@ -10,6 +10,7 @@
 package org.elasticsearch.gradle.internal.conventions;
 
 import org.elasticsearch.gradle.internal.conventions.info.GitInfo;
+import org.elasticsearch.gradle.internal.conventions.info.GitInfoValueSource;
 import org.elasticsearch.gradle.internal.conventions.util.Util;
 import org.gradle.api.Plugin;
 import org.gradle.api.Project;
@@ -18,38 +19,28 @@ import org.gradle.api.provider.Property;
 import org.gradle.api.provider.Provider;
 import org.gradle.api.provider.ProviderFactory;
 
-import javax.inject.Inject;
 import java.io.File;
 
-class GitInfoPlugin implements Plugin<Project> {
+import javax.inject.Inject;
+
+public abstract class GitInfoPlugin implements Plugin<Project> {
 
     private ProviderFactory factory;
-    private ObjectFactory objectFactory;
-
     private Provider<String> revision;
-    private Property<GitInfo> gitInfo;
 
     @Inject
-    GitInfoPlugin(ProviderFactory factory, ObjectFactory objectFactory) {
+    public GitInfoPlugin(ProviderFactory factory) {
         this.factory = factory;
-        this.objectFactory = objectFactory;
     }
 
     @Override
     public void apply(Project project) {
         File rootDir = Util.locateElasticsearchWorkspace(project.getGradle());
-        gitInfo = objectFactory.property(GitInfo.class).value(factory.provider(() ->
-            GitInfo.gitInfo(rootDir)
-        ));
-        gitInfo.disallowChanges();
-        gitInfo.finalizeValueOnRead();
-
-        revision = gitInfo.map(info -> info.getRevision() == null ? info.getRevision() : "main");
+        getGitInfo().convention(factory.of(GitInfoValueSource.class, spec -> { spec.getParameters().getPath().set(rootDir); }));
+        revision = getGitInfo().map(info -> info.getRevision() == null ? info.getRevision() : "main");
     }
 
-    public Property<GitInfo> getGitInfo() {
-        return gitInfo;
-    }
+    public abstract Property<GitInfo> getGitInfo();
 
     public Provider<String> getRevision() {
         return revision;

build-conventions/src/main/java/org/elasticsearch/gradle/internal/conventions/LicensingPlugin.java

@@ -15,9 +15,10 @@ import org.gradle.api.provider.MapProperty;
 import org.gradle.api.provider.Provider;
 import org.gradle.api.provider.ProviderFactory;
 
-import javax.inject.Inject;
 import java.util.Map;
 
+import javax.inject.Inject;
+
 public class LicensingPlugin implements Plugin<Project> {
     static final String ELASTIC_LICENSE_URL_PREFIX = "https://raw.githubusercontent.com/elastic/elasticsearch/";
     static final String ELASTIC_LICENSE_URL_POSTFIX = "/licenses/ELASTIC-LICENSE-2.0.txt";
@@ -33,22 +34,31 @@ public class LicensingPlugin implements Plugin<Project> {
     @Override
     public void apply(Project project) {
         Provider<String> revision = project.getRootProject().getPlugins().apply(GitInfoPlugin.class).getRevision();
-        Provider<String> licenseCommitProvider = providerFactory.provider(() ->
-             isSnapshotVersion(project) ? revision.get() : "v" + project.getVersion()
+        Provider<String> licenseCommitProvider = providerFactory.provider(
+            () -> isSnapshotVersion(project) ? revision.get() : "v" + project.getVersion()
         );
 
-        Provider<String> elasticLicenseURL = licenseCommitProvider.map(licenseCommit -> ELASTIC_LICENSE_URL_PREFIX +
-                licenseCommit + ELASTIC_LICENSE_URL_POSTFIX);
-        Provider<String> agplLicenseURL = licenseCommitProvider.map(licenseCommit -> ELASTIC_LICENSE_URL_PREFIX +
-            licenseCommit + AGPL_ELASTIC_LICENSE_URL_POSTFIX);
+        Provider<String> elasticLicenseURL = licenseCommitProvider.map(
+            licenseCommit -> ELASTIC_LICENSE_URL_PREFIX + licenseCommit + ELASTIC_LICENSE_URL_POSTFIX
+        );
+        Provider<String> agplLicenseURL = licenseCommitProvider.map(
+            licenseCommit -> ELASTIC_LICENSE_URL_PREFIX + licenseCommit + AGPL_ELASTIC_LICENSE_URL_POSTFIX
+        );
         // But stick the Elastic license url in project.ext so we can get it if we need to switch to it
         project.getExtensions().getExtraProperties().set("elasticLicenseUrl", elasticLicenseURL);
 
-        MapProperty<String, String> licensesProperty = project.getObjects().mapProperty(String.class, String.class).convention(
-                providerFactory.provider(() -> Map.of(
-                        "Server Side Public License, v 1", "https://www.mongodb.com/licensing/server-side-public-license",
-                        "Elastic License 2.0", elasticLicenseURL.get(),
-                        "GNU Affero General Public License Version 3", agplLicenseURL.get())
+        MapProperty<String, Provider<String>> licensesProperty = project.getObjects()
+            .mapProperty(String.class, (Class<Provider<String>>) (Class<?>) Provider.class)
+            .convention(
+                providerFactory.provider(
+                    () -> Map.of(
+                        "Server Side Public License, v 1",
+                        providerFactory.provider(() -> "https://www.mongodb.com/licensing/server-side-public-license"),
+                        "Elastic License 2.0",
+                        elasticLicenseURL,
+                        "GNU Affero General Public License Version 3",
+                        agplLicenseURL
+                    )
                 )
             );
 

build-conventions/src/main/java/org/elasticsearch/gradle/internal/conventions/PublishPlugin.java

@@ -28,6 +28,7 @@ import org.gradle.api.plugins.ExtensionContainer;
 import org.gradle.api.plugins.JavaLibraryPlugin;
 import org.gradle.api.plugins.JavaPlugin;
 import org.gradle.api.provider.MapProperty;
+import org.gradle.api.provider.Provider;
 import org.gradle.api.provider.ProviderFactory;
 import org.gradle.api.publish.PublishingExtension;
 import org.gradle.api.publish.maven.MavenPublication;
@@ -42,6 +43,7 @@ import org.w3c.dom.Element;
 import java.io.File;
 import java.util.Map;
 import java.util.concurrent.Callable;
+
 import javax.inject.Inject;
 
 public class PublishPlugin implements Plugin<Project> {
@@ -81,7 +83,7 @@ public class PublishPlugin implements Plugin<Project> {
             }
         });
         @SuppressWarnings("unchecked")
-        var projectLicenses = (MapProperty<String, String>) project.getExtensions().getExtraProperties().get("projectLicenses");
+        var projectLicenses = (MapProperty<String, Provider<String>>) project.getExtensions().getExtraProperties().get("projectLicenses");
         publication.getPom().withXml(xml -> {
             var node = xml.asNode();
             node.appendNode("inceptionYear", "2009");
@@ -89,7 +91,7 @@ public class PublishPlugin implements Plugin<Project> {
             projectLicenses.get().entrySet().stream().sorted(Map.Entry.comparingByKey()).forEach(entry -> {
                 Node license = licensesNode.appendNode("license");
                 license.appendNode("name", entry.getKey());
-                license.appendNode("url", entry.getValue());
+                license.appendNode("url", entry.getValue().get());
                 license.appendNode("distribution", "repo");
             });
             var developer = node.appendNode("developers").appendNode("developer");
@@ -194,7 +196,6 @@ public class PublishPlugin implements Plugin<Project> {
         });
     }
 
-
     /**
      * Format the generated pom files to be in a sort of reproducible order.
      */

build-conventions/src/main/java/org/elasticsearch/gradle/internal/conventions/info/GitInfo.java

@@ -22,6 +22,7 @@ import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
+import java.util.Objects;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
@@ -190,4 +191,15 @@ public class GitInfo {
         }
     }
 
+    @Override
+    public boolean equals(Object o) {
+        if (o == null || getClass() != o.getClass()) return false;
+        GitInfo gitInfo = (GitInfo) o;
+        return Objects.equals(revision, gitInfo.revision) && Objects.equals(origin, gitInfo.origin);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(revision, origin);
+    }
 }

build-conventions/src/main/java/org/elasticsearch/gradle/internal/conventions/info/GitInfoValueSource.java

@@ -0,0 +1,22 @@
+package org.elasticsearch.gradle.internal.conventions.info;
+
+import org.gradle.api.provider.Property;
+import org.gradle.api.provider.ValueSource;
+import org.gradle.api.provider.ValueSourceParameters;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.File;
+
+public abstract class GitInfoValueSource implements ValueSource<GitInfo, GitInfoValueSource.Parameters> {
+
+    @Nullable
+    @Override
+    public GitInfo obtain() {
+        File path = getParameters().getPath().get();
+        return GitInfo.gitInfo(path);
+    }
+
+    public interface Parameters extends ValueSourceParameters {
+        Property<File> getPath();
+    }
+}

build-tools-internal/src/integTest/groovy/org/elasticsearch/gradle/internal/PublishPluginFuncTest.groovy

@@ -45,7 +45,8 @@ class PublishPluginFuncTest extends AbstractGradleFuncTest {
         file("build/distributions/hello-world-1.0-javadoc.jar").exists()
         file("build/distributions/hello-world-1.0-sources.jar").exists()
         file("build/distributions/hello-world-1.0.pom").exists()
-        assertXmlEquals(file("build/distributions/hello-world-1.0.pom").text, """
+        assertXmlEquals(
+            file("build/distributions/hello-world-1.0.pom").text, """
             <project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
   <!-- This module was also published with a richer model, Gradle metadata,  -->
   <!-- which should be used instead. Do not delete the following line which  -->
@@ -130,7 +131,8 @@ class PublishPluginFuncTest extends AbstractGradleFuncTest {
         file("build/distributions/hello-world-1.0-javadoc.jar").exists()
         file("build/distributions/hello-world-1.0-sources.jar").exists()
         file("build/distributions/hello-world-1.0.pom").exists()
-        assertXmlEquals(file("build/distributions/hello-world-1.0.pom").text, """
+        assertXmlEquals(
+            file("build/distributions/hello-world-1.0.pom").text, """
             <project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
               <modelVersion>4.0.0</modelVersion>
               <groupId>org.acme</groupId>
@@ -219,7 +221,8 @@ class PublishPluginFuncTest extends AbstractGradleFuncTest {
         file("build/distributions/hello-world-1.0-javadoc.jar").exists()
         file("build/distributions/hello-world-1.0-sources.jar").exists()
         file("build/distributions/hello-world-1.0.pom").exists()
-        assertXmlEquals(file("build/distributions/hello-world-1.0.pom").text, """
+        assertXmlEquals(
+            file("build/distributions/hello-world-1.0.pom").text, """
             <project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
               <modelVersion>4.0.0</modelVersion>
               <groupId>org.acme</groupId>
@@ -312,7 +315,8 @@ class PublishPluginFuncTest extends AbstractGradleFuncTest {
         file("build/distributions/hello-world-plugin-1.0-javadoc.jar").exists()
         file("build/distributions/hello-world-plugin-1.0-sources.jar").exists()
         file("build/distributions/hello-world-plugin-1.0.pom").exists()
-        assertXmlEquals(file("build/distributions/hello-world-plugin-1.0.pom").text, """
+        assertXmlEquals(
+            file("build/distributions/hello-world-plugin-1.0.pom").text, """
             <project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
               <!-- This module was also published with a richer model, Gradle metadata,  -->
               <!-- which should be used instead. Do not delete the following line which  -->
@@ -389,7 +393,8 @@ class PublishPluginFuncTest extends AbstractGradleFuncTest {
         then:
         result.task(":generatePom").outcome == TaskOutcome.SUCCESS
         file("build/distributions/hello-world-plugin-2.0.pom").exists()
-        assertXmlEquals(file("build/distributions/hello-world-plugin-2.0.pom").text, """
+        assertXmlEquals(
+            file("build/distributions/hello-world-plugin-2.0.pom").text, """
             <project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
               <!-- This module was also published with a richer model, Gradle metadata,  -->
               <!-- which should be used instead. Do not delete the following line which  -->
@@ -439,7 +444,7 @@ class PublishPluginFuncTest extends AbstractGradleFuncTest {
         // scm info only added for internal builds
         internalBuild()
         buildFile << """
-            buildParams.setGitOrigin("https://some-repo.com/repo.git")
+            buildParams.setGitOrigin(project.providers.provider(() -> "https://some-repo.com/repo.git"))
             apply plugin:'elasticsearch.java'
             apply plugin:'elasticsearch.publish'
 
@@ -447,7 +452,7 @@ class PublishPluginFuncTest extends AbstractGradleFuncTest {
             group = 'org.acme'
             description = "just a test project"
 
-            ext.projectLicenses.set(['The Apache Software License, Version 2.0': 'http://www.apache.org/licenses/LICENSE-2.0'])
+            ext.projectLicenses.set(['The Apache Software License, Version 2.0': project.providers.provider(() -> 'http://www.apache.org/licenses/LICENSE-2.0')])
         """
 
         when:
@@ -456,7 +461,8 @@ class PublishPluginFuncTest extends AbstractGradleFuncTest {
         then:
         result.task(":generatePom").outcome == TaskOutcome.SUCCESS
         file("build/distributions/hello-world-1.0.pom").exists()
-        assertXmlEquals(file("build/distributions/hello-world-1.0.pom").text, """
+        assertXmlEquals(
+            file("build/distributions/hello-world-1.0.pom").text, """
             <project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
           <!-- This module was also published with a richer model, Gradle metadata,  -->
           <!-- which should be used instead. Do not delete the following line which  -->

build-tools-internal/src/main/groovy/elasticsearch.ide.gradle

@@ -166,7 +166,7 @@ if (providers.systemProperty('idea.active').getOrNull() == 'true') {
   tasks.register('buildDependencyArtifacts') {
     group = 'ide'
     description = 'Builds artifacts needed as dependency for IDE modules'
-    dependsOn([':plugins:repository-hdfs:hadoop-client-api:shadowJar',
+    dependsOn([':plugins:repository-hdfs:hadoop-client-api:jar',
       ':x-pack:plugin:esql:compute:ann:jar',
       ':x-pack:plugin:esql:compute:gen:jar',
       ':server:generateModulesList',

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/ElasticsearchJavaPlugin.java

@@ -27,6 +27,7 @@ import org.gradle.api.plugins.BasePlugin;
 import org.gradle.api.plugins.JavaLibraryPlugin;
 import org.gradle.api.plugins.JavaPlugin;
 import org.gradle.api.provider.Property;
+import org.gradle.api.provider.Provider;
 import org.gradle.api.tasks.TaskProvider;
 import org.gradle.api.tasks.bundling.Jar;
 import org.gradle.api.tasks.javadoc.Javadoc;
@@ -120,12 +121,12 @@ public class ElasticsearchJavaPlugin implements Plugin<Project> {
     }
 
     private static void configureJarManifest(Project project, BuildParameterExtension buildParams) {
-        String gitOrigin = buildParams.getGitOrigin();
-        String gitRevision = buildParams.getGitRevision();
+        Provider<String> gitOrigin = buildParams.getGitOrigin();
+        Provider<String> gitRevision = buildParams.getGitRevision();
 
         project.getPlugins().withType(InfoBrokerPlugin.class).whenPluginAdded(manifestPlugin -> {
-            manifestPlugin.add("Module-Origin", toStringable(() -> gitOrigin));
-            manifestPlugin.add("Change", toStringable(() -> gitRevision));
+            manifestPlugin.add("Module-Origin", toStringable(() -> gitOrigin.get()));
+            manifestPlugin.add("Change", toStringable(() -> gitRevision.get()));
             manifestPlugin.add("X-Compile-Elasticsearch-Version", toStringable(VersionProperties::getElasticsearch));
             manifestPlugin.add("X-Compile-Lucene-Version", toStringable(VersionProperties::getLucene));
             manifestPlugin.add(

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/info/BuildParameterExtension.java

@@ -46,9 +46,9 @@ public interface BuildParameterExtension {
 
     Provider<String> getRuntimeJavaDetails();
 
-    String getGitRevision();
+    Provider<String> getGitRevision();
 
-    String getGitOrigin();
+    Provider<String> getGitOrigin();
 
     ZonedDateTime getBuildDate();
 

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/info/DefaultBuildParameterExtension.java

@@ -36,7 +36,7 @@ public abstract class DefaultBuildParameterExtension implements BuildParameterEx
     private final Provider<JavaVersion> runtimeJavaVersion;
     private final Provider<? extends Action<JavaToolchainSpec>> javaToolChainSpec;
     private final Provider<String> runtimeJavaDetails;
-    private final String gitRevision;
+    private final Provider<String> gitRevision;
 
     private transient AtomicReference<ZonedDateTime> buildDate = new AtomicReference<>();
     private final String testSeed;
@@ -46,7 +46,7 @@ public abstract class DefaultBuildParameterExtension implements BuildParameterEx
 
     // not final for testing
     private Provider<BwcVersions> bwcVersions;
-    private String gitOrigin;
+    private Provider<String> gitOrigin;
 
     public DefaultBuildParameterExtension(
         ProviderFactory providers,
@@ -59,8 +59,8 @@ public abstract class DefaultBuildParameterExtension implements BuildParameterEx
         JavaVersion minimumCompilerVersion,
         JavaVersion minimumRuntimeVersion,
         JavaVersion gradleJavaVersion,
-        String gitRevision,
-        String gitOrigin,
+        Provider<String> gitRevision,
+        Provider<String> gitOrigin,
         String testSeed,
         boolean isCi,
         int defaultParallel,
@@ -155,12 +155,12 @@ public abstract class DefaultBuildParameterExtension implements BuildParameterEx
     }
 
     @Override
-    public String getGitRevision() {
+    public Provider<String> getGitRevision() {
         return gitRevision;
     }
 
     @Override
-    public String getGitOrigin() {
+    public Provider<String> getGitOrigin() {
         return gitOrigin;
     }
 
@@ -239,7 +239,7 @@ public abstract class DefaultBuildParameterExtension implements BuildParameterEx
     }
 
     // for testing; not part of public api
-    public void setGitOrigin(String gitOrigin) {
+    public void setGitOrigin(Provider<String> gitOrigin) {
         this.gitOrigin = gitOrigin;
     }
 }

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/info/GlobalBuildInfoPlugin.java

@@ -14,6 +14,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import org.apache.commons.io.IOUtils;
 import org.elasticsearch.gradle.VersionProperties;
 import org.elasticsearch.gradle.internal.BwcVersions;
+import org.elasticsearch.gradle.internal.conventions.GitInfoPlugin;
 import org.elasticsearch.gradle.internal.conventions.info.GitInfo;
 import org.elasticsearch.gradle.internal.conventions.info.ParallelDetector;
 import org.elasticsearch.gradle.internal.conventions.util.Util;
@@ -96,6 +97,8 @@ public class GlobalBuildInfoPlugin implements Plugin<Project> {
         }
         this.project = project;
         project.getPlugins().apply(JvmToolchainsPlugin.class);
+        Provider<GitInfo> gitInfo = project.getPlugins().apply(GitInfoPlugin.class).getGitInfo();
+
         toolChainService = project.getExtensions().getByType(JavaToolchainService.class);
         GradleVersion minimumGradleVersion = GradleVersion.version(getResourceContents("/minimumGradleVersion"));
         if (GradleVersion.current().compareTo(minimumGradleVersion) < 0) {
@@ -111,8 +114,6 @@ public class GlobalBuildInfoPlugin implements Plugin<Project> {
             ? explicitRuntimeJavaHome
             : resolveJavaHomeFromToolChainService(VersionProperties.getBundledJdkMajorVersion());
 
-        GitInfo gitInfo = GitInfo.gitInfo(project.getRootDir());
-
         Provider<JvmInstallationMetadata> runtimeJdkMetaData = actualRuntimeJavaHome.map(
             runtimeJavaHome -> metadataDetector.getMetadata(getJavaInstallation(runtimeJavaHome))
         );
@@ -143,8 +144,8 @@ public class GlobalBuildInfoPlugin implements Plugin<Project> {
                 minimumCompilerVersion,
                 minimumRuntimeVersion,
                 Jvm.current().getJavaVersion(),
-                gitInfo.getRevision(),
-                gitInfo.getOrigin(),
+                gitInfo.map(g -> g.getRevision()),
+                gitInfo.map(g -> g.getOrigin()),
                 getTestSeed(),
                 System.getenv("JENKINS_URL") != null || System.getenv("BUILDKITE_BUILD_URL") != null || System.getProperty("isCI") != null,
                 ParallelDetector.findDefaultParallel(project),

build-tools-internal/src/test/groovy/org/elasticsearch/gradle/internal/info/BuildParameterExtensionSpec.groovy

@@ -9,9 +9,9 @@
 
 package org.elasticsearch.gradle.internal.info
 
+import spock.lang.Ignore
 import spock.lang.Specification
 
-import org.elasticsearch.gradle.internal.BwcVersions
 import org.gradle.api.JavaVersion
 import org.gradle.api.Project
 import org.gradle.api.provider.Provider
@@ -31,6 +31,7 @@ class BuildParameterExtensionSpec extends Specification {
 
     ProjectBuilder projectBuilder = new ProjectBuilder()
 
+    @Ignore
     def "#getterName is cached anc concurrently accessible"() {
         given:
         def project = projectBuilder.build()
@@ -85,8 +86,8 @@ class BuildParameterExtensionSpec extends Specification {
             JavaVersion.VERSION_11,
             JavaVersion.VERSION_11,
             JavaVersion.VERSION_11,
-            "gitRevision",
-            "gitOrigin",
+            providerMock(),
+            providerMock(),
             "testSeed",
             false,
             5,

client/rest/build.gradle

@@ -36,7 +36,7 @@ base {
 }
 
 // LLRC is licenses under Apache 2.0
-projectLicenses.set(['The Apache Software License, Version 2.0': 'http://www.apache.org/licenses/LICENSE-2.0'])
+projectLicenses.set(['The Apache Software License, Version 2.0': providers.provider(() -> 'http://www.apache.org/licenses/LICENSE-2.0')])
 licenseFile.set(rootProject.file('licenses/APACHE-LICENSE-2.0.txt'))
 
 dependencies {

client/sniffer/build.gradle

@@ -32,7 +32,7 @@ base {
 }
 
 // rest client sniffer is licenses under Apache 2.0
-projectLicenses.set(['The Apache Software License, Version 2.0': 'http://www.apache.org/licenses/LICENSE-2.0'])
+projectLicenses.set(['The Apache Software License, Version 2.0': providers.provider(() -> 'http://www.apache.org/licenses/LICENSE-2.0')])
 licenseFile.set(rootProject.file('licenses/APACHE-LICENSE-2.0.txt'))
 
 dependencies {

client/test/build.gradle

@@ -18,7 +18,7 @@ java {
 group = "${group}.client.test"
 
 // rest client sniffer is licenses under Apache 2.0
-projectLicenses.set(['The Apache Software License, Version 2.0': 'http://www.apache.org/licenses/LICENSE-2.0'])
+projectLicenses.set(['The Apache Software License, Version 2.0': providers.provider(() -> 'http://www.apache.org/licenses/LICENSE-2.0')])
 licenseFile.set(rootProject.file('licenses/APACHE-LICENSE-2.0.txt'))
 
 dependencies {

distribution/docker/src/docker/Dockerfile

@@ -22,7 +22,7 @@
 <% if (docker_base == 'iron_bank') { %>
 ARG BASE_REGISTRY=registry1.dso.mil
 ARG BASE_IMAGE=ironbank/redhat/ubi/ubi9
-ARG BASE_TAG=9.4
+ARG BASE_TAG=9.5
 <% } %>
 
 ################################################################################

docs/changelog/116868.yaml

@@ -0,0 +1,5 @@
+pr: 116868
+summary: Run `TransportGetComponentTemplateAction` on local node
+area: Indices APIs
+type: enhancement
+issues: []

docs/changelog/117214.yaml

@@ -0,0 +1,5 @@
+pr: 117214
+summary: Returning ignored fields in the simulate ingest API
+area: Ingest Node
+type: enhancement
+issues: []

docs/changelog/118016.yaml

@@ -0,0 +1,6 @@
+pr: 118016
+summary: Propagate status codes from shard failures appropriately
+area: Search
+type: enhancement
+issues:
+ - 118482

docs/changelog/118870.yaml

@@ -0,0 +1,6 @@
+pr: 118870
+summary: Rewrite TO_UPPER/TO_LOWER comparisons
+area: ES|QL
+type: enhancement
+issues:
+ - 118304

docs/changelog/118999.yaml

@@ -0,0 +1,6 @@
+pr: 118999
+summary: Fix loss of context in the inference API for streaming APIs
+area: Machine Learning
+type: bug
+issues:
+ - 119000

docs/changelog/119134.yaml

@@ -0,0 +1,6 @@
+pr: 119134
+summary: Handle `index.mapping.ignore_malformed` in downsampling
+area: Downsampling
+type: bug
+issues:
+ - 119075

docs/reference/indices/get-component-template.asciidoc

@@ -67,7 +67,7 @@ Wildcard (`*`) expressions are supported.
 
 include::{docdir}/rest-api/common-parms.asciidoc[tag=flat-settings]
 
-include::{docdir}/rest-api/common-parms.asciidoc[tag=local]
+include::{docdir}/rest-api/common-parms.asciidoc[tag=local-deprecated-9.0.0]
 
 include::{docdir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 

docs/reference/rest-api/common-parms.asciidoc

@@ -668,6 +668,16 @@ node only. Defaults to `false`, which means information is retrieved from
 the master node.
 end::local[]
 
+tag::local-deprecated-9.0.0[]
+`local`::
+(Optional, Boolean) If `true`, the request retrieves information from the local
+node only. Defaults to `false`, which means information is retrieved from
+the master node.
++
+deprecated::[9.0.0, "The `?local` query parameter to this API has no effect, is now deprecated, and will be removed in a future version."]
+
+end::local-deprecated-9.0.0[]
+
 tag::mappings[]
 `mappings`::
 +

docs/reference/rest-api/usage.asciidoc

@@ -207,16 +207,8 @@ GET /_xpack/usage
   "inference": {
     "available" : true,
     "enabled" : true,
-    "models" : [{
-        "service": "elasticsearch",
-        "task_type": "SPARSE_EMBEDDING",
-        "count": 1
-      },
-      {
-        "service": "elasticsearch",
-        "task_type": "TEXT_EMBEDDING",
-        "count": 1
-      },
+    "models" : [
+      ...
     ]
   },
   "logstash" : {
@@ -523,7 +515,10 @@ GET /_xpack/usage
     "available": true,
     "enabled": false,
     "indices_count": 0,
-    "indices_with_synthetic_source": 0
+    "indices_with_synthetic_source": 0,
+    "num_docs": 0,
+    "size_in_bytes": 0,
+    "has_custom_cutoff_date": false
   }
 }
 ------------------------------------------------------------
@@ -535,6 +530,7 @@ GET /_xpack/usage
 // TESTRESPONSE[s/"policy_stats" : \[[^\]]*\]/"policy_stats" : $body.$_path/]
 // TESTRESPONSE[s/"slm" : \{[^\}]*\},/"slm" : $body.$_path,/]
 // TESTRESPONSE[s/"health_api" : \{[^\}]*\}\s*\}/"health_api" : $body.$_path/]
+// TESTRESPONSE[s/"models" : \[[^\]]*\]/"models" : $body.$_path/]
 // TESTRESPONSE[s/"data_streams" : \{[^\}]*\},/"data_streams" : $body.$_path,/]
 // TESTRESPONSE[s/ : true/ : $body.$_path/]
 // TESTRESPONSE[s/ : false/ : $body.$_path/]
@@ -551,4 +547,5 @@ GET /_xpack/usage
 // 5. All of the numbers and strings on the right hand side of *every* field in
 //    the response are ignored. So we're really only asserting things about the
 //    the shape of this response, not the values in it.
-// 6. Ignore the contents of data streams until the failure store is tech preview.
+// 6. Ignore the contents of the `inference.models` array because the models might not yet have been initialized
+// 7. Ignore the contents of data streams until the failure store is tech preview.

libs/h3/build.gradle

@@ -35,7 +35,7 @@ tasks.named('forbiddenApisMain').configure {
   replaceSignatureFiles 'jdk-signatures'
 }
 
-ext.projectLicenses.set(['The Apache Software License, Version 2.0': 'http://www.apache.org/licenses/LICENSE-2.0'])
+ext.projectLicenses.set(['The Apache Software License, Version 2.0': providers.provider(() -> 'http://www.apache.org/licenses/LICENSE-2.0')])
 licenseFile.set(rootProject.file('licenses/APACHE-LICENSE-2.0.txt'))
 
 tasks.withType(LicenseHeadersTask.class).configureEach {

libs/tdigest/build.gradle

@@ -36,7 +36,7 @@ tasks.named('forbiddenApisMain').configure {
   replaceSignatureFiles 'jdk-signatures'
 }
 
-ext.projectLicenses.set(['The Apache Software License, Version 2.0': 'http://www.apache.org/licenses/LICENSE-2.0'])
+ext.projectLicenses.set(['The Apache Software License, Version 2.0': providers.provider(() -> 'http://www.apache.org/licenses/LICENSE-2.0')])
 licenseFile.set(rootProject.file('licenses/APACHE-LICENSE-2.0.txt'))
 
 tasks.withType(LicenseHeadersTask.class).configureEach {

muted-tests.yml

@@ -64,9 +64,6 @@ tests:
 - class: org.elasticsearch.xpack.inference.TextEmbeddingCrudIT
   method: testPutE5Small_withPlatformSpecificVariant
   issue: https://github.com/elastic/elasticsearch/issues/113950
-- class: org.elasticsearch.smoketest.DocsClientYamlTestSuiteIT
-  method: test {yaml=reference/rest-api/usage/line_38}
-  issue: https://github.com/elastic/elasticsearch/issues/113694
 - class: org.elasticsearch.xpack.remotecluster.RemoteClusterSecurityWithApmTracingRestIT
   method: testTracingCrossCluster
   issue: https://github.com/elastic/elasticsearch/issues/112731
@@ -233,8 +230,6 @@ tests:
 - class: org.elasticsearch.packaging.test.ArchiveTests
   method: test51AutoConfigurationWithPasswordProtectedKeystore
   issue: https://github.com/elastic/elasticsearch/issues/118212
-- class: org.elasticsearch.ingest.common.IngestCommonClientYamlTestSuiteIT
-  issue: https://github.com/elastic/elasticsearch/issues/118215
 - class: org.elasticsearch.datastreams.DataStreamsClientYamlTestSuiteIT
   method: test {p0=data_stream/120_data_streams_stats/Multiple data stream}
   issue: https://github.com/elastic/elasticsearch/issues/118217
@@ -305,6 +300,9 @@ tests:
 - class: org.elasticsearch.xpack.esql.action.EsqlNodeFailureIT
   method: testFailureLoadingFields
   issue: https://github.com/elastic/elasticsearch/issues/118000
+- class: org.elasticsearch.smoketest.SmokeTestMultiNodeClientYamlTestSuiteIT
+  method: test {yaml=indices.create/20_synthetic_source/create index with use_synthetic_source}
+  issue: https://github.com/elastic/elasticsearch/issues/119191
 
 # Examples:
 #

plugins/repository-hdfs/build.gradle

@@ -28,7 +28,7 @@ configurations {
 }
 
 dependencies {
-  api project(path: 'hadoop-client-api', configuration: 'shadow')
+  api project(path: 'hadoop-client-api', configuration: 'default')
   if (isEclipse) {
     /*
      * Eclipse can't pick up the shadow dependency so we point it at *something*

plugins/repository-hdfs/hadoop-client-api/build.gradle

@@ -1,16 +1,46 @@
-apply plugin: 'elasticsearch.build'
-apply plugin: 'com.gradleup.shadow'
+apply plugin: 'elasticsearch.java'
+
+sourceSets {
+  patcher
+}
+
+configurations {
+  thejar {
+    canBeResolved = true
+  }
+}
 
 dependencies {
-  implementation "org.apache.hadoop:hadoop-client-api:${project.parent.versions.hadoop}"
+  thejar("org.apache.hadoop:hadoop-client-api:${project.parent.versions.hadoop}") {
+    transitive = false
   }
 
-tasks.named('shadowJar').configure {
-  exclude 'org/apache/hadoop/util/ShutdownHookManager$*.class'
+  patcherImplementation 'org.ow2.asm:asm:9.7.1'
+  patcherImplementation 'org.ow2.asm:asm-tree:9.7.1'
 }
 
-['jarHell', 'thirdPartyAudit', 'forbiddenApisMain', 'splitPackagesAudit'].each {
-  tasks.named(it).configure {
-    enabled = false
+def outputDir = layout.buildDirectory.dir("patched-classes")
+
+def patchTask = tasks.register("patchClasses", JavaExec) {
+  inputs.files(configurations.thejar).withPathSensitivity(PathSensitivity.RELATIVE)
+  inputs.files(sourceSets.patcher.output).withPathSensitivity(PathSensitivity.RELATIVE)
+  outputs.dir(outputDir)
+  classpath = sourceSets.patcher.runtimeClasspath
+  mainClass = 'org.elasticsearch.hdfs.patch.HdfsClassPatcher'
+  doFirst {
+    args(configurations.thejar.singleFile, outputDir.get().asFile)
+  }
+}
+
+tasks.named('jar').configure {
+  dependsOn(configurations.thejar)
+
+  from(patchTask)
+  from({ project.zipTree(configurations.thejar.singleFile) }) {
+    eachFile {
+      if (outputDir.get().file(it.relativePath.pathString).asFile.exists()) {
+        it.exclude()
+      }
+    }
   }
 }

plugins/repository-hdfs/hadoop-client-api/src/main/java/org/apache/hadoop/util/ShutdownHookManager.java

@@ -1,48 +0,0 @@
-/*
- * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
- * or more contributor license agreements. Licensed under the "Elastic License
- * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
- * Public License v 1"; you may not use this file except in compliance with, at
- * your election, the "Elastic License 2.0", the "GNU Affero General Public
- * License v3.0 only", or the "Server Side Public License, v 1".
- */
-
-package org.apache.hadoop.util;
-
-import java.util.concurrent.TimeUnit;
-
-/**
- * A replacement for the ShutdownHookManager from hadoop.
- *
- * This class does not actually add a shutdown hook. Hadoop's shutdown hook
- * manager does not fail gracefully when it lacks security manager permissions
- * to add shutdown hooks. This implements the same api as the hadoop class, but
- * with no-ops.
- */
-public class ShutdownHookManager {
-    private static final ShutdownHookManager MGR = new ShutdownHookManager();
-
-    public static ShutdownHookManager get() {
-        return MGR;
-    }
-
-    private ShutdownHookManager() {}
-
-    public void addShutdownHook(Runnable shutdownHook, int priority) {}
-
-    public void addShutdownHook(Runnable shutdownHook, int priority, long timeout, TimeUnit unit) {}
-
-    public boolean removeShutdownHook(Runnable shutdownHook) {
-        return false;
-    }
-
-    public boolean hasShutdownHook(Runnable shutdownHook) {
-        return false;
-    }
-
-    public boolean isShutdownInProgress() {
-        return false;
-    }
-
-    public void clearShutdownHooks() {}
-}

plugins/repository-hdfs/hadoop-client-api/src/patcher/java/org/elasticsearch/hdfs/patch/HdfsClassPatcher.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.hdfs.patch;
+
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.ClassWriter;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+
+public class HdfsClassPatcher {
+    static final Map<String, Function<ClassWriter, ClassVisitor>> patchers = Map.of(
+        "org/apache/hadoop/util/ShutdownHookManager.class",
+        ShutdownHookManagerPatcher::new,
+        "org/apache/hadoop/util/Shell.class",
+        ShellPatcher::new
+    );
+
+    public static void main(String[] args) throws Exception {
+        String jarPath = args[0];
+        Path outputDir = Paths.get(args[1]);
+
+        try (JarFile jarFile = new JarFile(new File(jarPath))) {
+            for (var patcher : patchers.entrySet()) {
+                JarEntry jarEntry = jarFile.getJarEntry(patcher.getKey());
+                if (jarEntry == null) {
+                    throw new IllegalArgumentException("path [" + patcher.getKey() + "] not found in [" + jarPath + "]");
+                }
+                byte[] classToPatch = jarFile.getInputStream(jarEntry).readAllBytes();
+
+                ClassReader classReader = new ClassReader(classToPatch);
+                ClassWriter classWriter = new ClassWriter(classReader, 0);
+                classReader.accept(patcher.getValue().apply(classWriter), 0);
+
+                Path outputFile = outputDir.resolve(patcher.getKey());
+                Files.createDirectories(outputFile.getParent());
+                Files.write(outputFile, classWriter.toByteArray());
+            }
+        }
+    }
+}

plugins/repository-hdfs/hadoop-client-api/src/patcher/java/org/elasticsearch/hdfs/patch/MethodReplacement.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.hdfs.patch;
+
+import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Opcodes;
+
+public class MethodReplacement extends MethodVisitor {
+    private final MethodVisitor delegate;
+    private final Runnable bodyWriter;
+
+    MethodReplacement(MethodVisitor delegate, Runnable bodyWriter) {
+        super(Opcodes.ASM9);
+        this.delegate = delegate;
+        this.bodyWriter = bodyWriter;
+    }
+
+    @Override
+    public void visitCode() {
+        // delegate.visitCode();
+        bodyWriter.run();
+        // delegate.visitEnd();
+    }
+
+    @Override
+    public void visitMaxs(int maxStack, int maxLocals) {
+        delegate.visitMaxs(maxStack, maxLocals);
+    }
+}

plugins/repository-hdfs/hadoop-client-api/src/patcher/java/org/elasticsearch/hdfs/patch/ShellPatcher.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.hdfs.patch;
+
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Opcodes;
+
+class ShellPatcher extends ClassVisitor {
+
+    ShellPatcher(ClassWriter classWriter) {
+        super(Opcodes.ASM9, classWriter);
+    }
+
+    @Override
+    public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
+        MethodVisitor mv = super.visitMethod(access, name, descriptor, signature, exceptions);
+        if (name.equals("isSetsidSupported")) {
+            return new MethodReplacement(mv, () -> {
+                mv.visitInsn(Opcodes.ICONST_0);
+                mv.visitInsn(Opcodes.IRETURN);
+            });
+        }
+        return mv;
+    }
+}

plugins/repository-hdfs/hadoop-client-api/src/patcher/java/org/elasticsearch/hdfs/patch/ShutdownHookManagerPatcher.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.hdfs.patch;
+
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.Type;
+
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.TimeUnit;
+
+class ShutdownHookManagerPatcher extends ClassVisitor {
+    private static final String CLASSNAME = "org/apache/hadoop/util/ShutdownHookManager";
+    private static final Set<String> VOID_METHODS = Set.of("addShutdownHook", "clearShutdownHooks");
+    private static final Set<String> BOOLEAN_METHODS = Set.of("removeShutdownHook", "hasShutdownHook", "isShutdownInProgress");
+
+    ShutdownHookManagerPatcher(ClassWriter classWriter) {
+        super(Opcodes.ASM9, classWriter);
+    }
+
+    @Override
+    public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
+        MethodVisitor mv = super.visitMethod(access, name, descriptor, signature, exceptions);
+        if (VOID_METHODS.contains(name)) {
+            // make void methods noops
+            return new MethodReplacement(mv, () -> { mv.visitInsn(Opcodes.RETURN); });
+        } else if (BOOLEAN_METHODS.contains(name)) {
+            // make boolean methods always return false
+            return new MethodReplacement(mv, () -> {
+                mv.visitInsn(Opcodes.ICONST_0);
+                mv.visitInsn(Opcodes.IRETURN);
+            });
+        } else if (name.equals("<clinit>")) {
+            return new MethodReplacement(mv, () -> {
+                // just initialize the statics, don't actually get runtime to add shutdown hook
+
+                var classType = Type.getObjectType(CLASSNAME);
+                mv.visitTypeInsn(Opcodes.NEW, CLASSNAME);
+                mv.visitInsn(Opcodes.DUP);
+                mv.visitMethodInsn(Opcodes.INVOKESPECIAL, CLASSNAME, "<init>", "()V", false);
+                mv.visitFieldInsn(Opcodes.PUTSTATIC, CLASSNAME, "MGR", classType.getDescriptor());
+
+                var timeUnitType = Type.getType(TimeUnit.class);
+                mv.visitFieldInsn(Opcodes.GETSTATIC, timeUnitType.getInternalName(), "SECONDS", timeUnitType.getDescriptor());
+                mv.visitFieldInsn(Opcodes.PUTSTATIC, CLASSNAME, "TIME_UNIT_DEFAULT", timeUnitType.getDescriptor());
+
+                var executorServiceType = Type.getType(ExecutorService.class);
+                mv.visitInsn(Opcodes.ACONST_NULL);
+                mv.visitFieldInsn(Opcodes.PUTSTATIC, CLASSNAME, "EXECUTOR", executorServiceType.getDescriptor());
+
+                mv.visitInsn(Opcodes.RETURN);
+            });
+        }
+        return mv;
+    }
+}

qa/rolling-upgrade/src/javaRestTest/java/org/elasticsearch/upgrades/FieldCapsIT.java

@@ -12,7 +12,6 @@ package org.elasticsearch.upgrades;
 import com.carrotsearch.randomizedtesting.annotations.Name;
 
 import org.apache.http.HttpHost;
-import org.apache.lucene.tests.util.LuceneTestCase.AwaitsFix;
 import org.elasticsearch.Build;
 import org.elasticsearch.action.fieldcaps.FieldCapabilitiesResponse;
 import org.elasticsearch.client.Request;
@@ -40,7 +39,6 @@ import static org.hamcrest.Matchers.equalTo;
  * In 8.2 we also added the ability to filter fields by type and metadata, with some post-hoc filtering applied on
  * the co-ordinating node if older nodes were included in the system
  */
-@AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/103473")
 public class FieldCapsIT extends AbstractRollingUpgradeTestCase {
 
     public FieldCapsIT(@Name("upgradedNodes") int upgradedNodes) {

qa/smoke-test-http/src/javaRestTest/java/org/elasticsearch/http/RestActionCancellationIT.java

@@ -15,6 +15,7 @@ import org.elasticsearch.action.admin.cluster.health.TransportClusterHealthActio
 import org.elasticsearch.action.admin.cluster.state.ClusterStateAction;
 import org.elasticsearch.action.admin.indices.alias.get.GetAliasesAction;
 import org.elasticsearch.action.admin.indices.recovery.RecoveryAction;
+import org.elasticsearch.action.admin.indices.template.get.GetComponentTemplateAction;
 import org.elasticsearch.action.support.CancellableActionTestPlugin;
 import org.elasticsearch.action.support.PlainActionFuture;
 import org.elasticsearch.action.support.RefCountingListener;
@@ -66,6 +67,10 @@ public class RestActionCancellationIT extends HttpSmokeTestCase {
         runRestActionCancellationTest(new Request(HttpGet.METHOD_NAME, "/_cat/aliases"), GetAliasesAction.NAME);
     }
 
+    public void testGetComponentTemplateCancellation() {
+        runRestActionCancellationTest(new Request(HttpGet.METHOD_NAME, "/_component_template"), GetComponentTemplateAction.NAME);
+    }
+
     private void runRestActionCancellationTest(Request request, String actionName) {
         final var node = usually() ? internalCluster().getRandomNodeName() : internalCluster().startCoordinatingOnlyNode(Settings.EMPTY);
 

qa/smoke-test-ingest-with-all-dependencies/src/yamlRestTest/resources/rest-api-spec/test/ingest/80_ingest_simulate.yml

@@ -1720,3 +1720,59 @@ setup:
   - match: { docs.0.doc._source.foo: 3 }
   - match: { docs.0.doc._source.bar: "some text value" }
   - not_exists: docs.0.doc.error
+
+---
+"Test ignored_fields":
+  - skip:
+      features:
+        - headers
+        - allowed_warnings
+
+  - requires:
+      cluster_features: ["simulate.ignored.fields"]
+      reason: "ingest simulate ignored fields added in 8.18"
+
+  - do:
+      headers:
+        Content-Type: application/json
+      simulate.ingest:
+        index: nonexistent
+        body: >
+          {
+            "docs": [
+              {
+                "_index": "simulate-test",
+                "_id": "y9Es_JIBiw6_GgN-U0qy",
+                "_score": 1,
+                "_source": {
+                  "abc": "sfdsfsfdsfsfdsfsfdsfsfdsfsfdsf"
+                }
+              }
+            ],
+            "index_template_substitutions": {
+              "ind_temp": {
+                "index_patterns": ["simulate-test"],
+                "composed_of": ["simulate-test"]
+              }
+            },
+            "component_template_substitutions": {
+              "simulate-test": {
+                "template": {
+                  "mappings": {
+                    "dynamic": false,
+                    "properties": {
+                      "abc": {
+                        "type": "keyword",
+                        "ignore_above": 1
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+  - length: { docs: 1 }
+  - match: { docs.0.doc._index: "simulate-test" }
+  - match: { docs.0.doc._source.abc: "sfdsfsfdsfsfdsfsfdsfsfdsfsfdsf" }
+  - match: { docs.0.doc.ignored_fields: [ {"field": "abc"} ] }
+  - not_exists: docs.0.doc.error

rest-api-spec/build.gradle

@@ -13,7 +13,7 @@ restResources {
 }
 
 // REST API specifications are published under the Apache 2.0 License
-ext.projectLicenses.set(['The Apache Software License, Version 2.0': 'http://www.apache.org/licenses/LICENSE-2.0'])
+ext.projectLicenses.set(['The Apache Software License, Version 2.0': providers.provider(() -> 'http://www.apache.org/licenses/LICENSE-2.0')])
 licenseFile.set(rootProject.file('licenses/APACHE-LICENSE-2.0.txt'))
 
 configurations {

rest-api-spec/src/main/resources/rest-api-spec/api/cluster.exists_component_template.json

@@ -28,9 +28,10 @@
     "params":{
       "master_timeout":{
         "type":"time",
-        "description":"Explicit operation timeout for connection to master node"
+        "description":"Timeout for waiting for new cluster state in case it is blocked"
       },
       "local":{
+        "deprecated":true,
         "type":"boolean",
         "description":"Return local information, do not retrieve the state from master node (default: false)"
       }

rest-api-spec/src/main/resources/rest-api-spec/api/cluster.get_component_template.json

@@ -34,9 +34,10 @@
     "params":{
       "master_timeout":{
         "type":"time",
-        "description":"Explicit operation timeout for connection to master node"
+        "description":"Timeout for waiting for new cluster state in case it is blocked"
       },
       "local":{
+        "deprecated":true,
         "type":"boolean",
         "description":"Return local information, do not retrieve the state from master node (default: false)"
       },

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/cluster.component_template/10_basic.yml

@@ -171,3 +171,33 @@
   - match: {component_templates.0.component_template.template.lifecycle.enabled: true}
   - match: {component_templates.0.component_template.template.lifecycle.data_retention: "10d"}
   - is_true: component_templates.0.component_template.template.lifecycle.rollover
+
+---
+"Deprecated local parameter":
+  - requires:
+      capabilities:
+        - method: GET
+          path: /_component_template
+          capabilities: ["local_param_deprecated"]
+      test_runner_features: ["capabilities", "warnings"]
+      reason: Deprecation was implemented with capability
+
+  - do:
+      cluster.get_component_template:
+        local: true
+      warnings:
+        - "the [?local] query parameter to this API has no effect, is now deprecated, and will be removed in a future version"
+
+---
+"Deprecated local parameter works in v8 compat mode":
+  - requires:
+      test_runner_features: ["headers"]
+
+  - do:
+      headers:
+        Content-Type: "application/vnd.elasticsearch+json;compatible-with=8"
+        Accept: "application/vnd.elasticsearch+json;compatible-with=8"
+      cluster.get_component_template:
+        local: true
+
+  - exists: component_templates

server/src/internalClusterTest/java/org/elasticsearch/reservedstate/service/ComponentTemplatesFileSettingsIT.java

@@ -463,7 +463,7 @@ public class ComponentTemplatesFileSettingsIT extends ESIntegTestCase {
 
         final var componentResponse = client().execute(
             GetComponentTemplateAction.INSTANCE,
-            new GetComponentTemplateAction.Request("other*")
+            new GetComponentTemplateAction.Request(TEST_REQUEST_TIMEOUT, "other*")
         ).get();
 
         assertTrue(componentResponse.getComponentTemplates().isEmpty());

server/src/main/java/org/elasticsearch/TransportVersions.java

@@ -146,6 +146,7 @@ public class TransportVersions {
     public static final TransportVersion NODE_VERSION_INFORMATION_WITH_MIN_READ_ONLY_INDEX_VERSION = def(8_810_00_0);
     public static final TransportVersion ERROR_TRACE_IN_TRANSPORT_HEADER = def(8_811_00_0);
     public static final TransportVersion FAILURE_STORE_ENABLED_BY_CLUSTER_SETTING = def(8_812_00_0);
+    public static final TransportVersion SIMULATE_IGNORED_FIELDS = def(8_813_00_0);
 
     /*
      * WARNING: DO NOT MERGE INTO MAIN!

server/src/main/java/org/elasticsearch/action/admin/indices/template/get/GetComponentTemplateAction.java

@@ -14,12 +14,17 @@ import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.ActionType;
 import org.elasticsearch.action.admin.indices.rollover.RolloverConfiguration;
-import org.elasticsearch.action.support.master.MasterNodeReadRequest;
+import org.elasticsearch.action.support.local.LocalClusterStateRequest;
 import org.elasticsearch.cluster.metadata.ComponentTemplate;
 import org.elasticsearch.cluster.metadata.DataStreamGlobalRetention;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.core.Nullable;
+import org.elasticsearch.core.TimeValue;
+import org.elasticsearch.core.UpdateForV10;
+import org.elasticsearch.tasks.CancellableTask;
+import org.elasticsearch.tasks.Task;
+import org.elasticsearch.tasks.TaskId;
 import org.elasticsearch.xcontent.ParseField;
 import org.elasticsearch.xcontent.ToXContentObject;
 import org.elasticsearch.xcontent.XContentBuilder;
@@ -43,22 +48,23 @@ public class GetComponentTemplateAction extends ActionType<GetComponentTemplateA
     /**
      * Request that to retrieve one or more component templates
      */
-    public static class Request extends MasterNodeReadRequest<Request> {
+    public static class Request extends LocalClusterStateRequest {
 
         @Nullable
         private String name;
         private boolean includeDefaults;
 
-        public Request() {
-            super(TRAPPY_IMPLICIT_DEFAULT_MASTER_NODE_TIMEOUT);
-        }
-
-        public Request(String name) {
-            super(TRAPPY_IMPLICIT_DEFAULT_MASTER_NODE_TIMEOUT);
+        public Request(TimeValue masterTimeout, String name) {
+            super(masterTimeout);
             this.name = name;
             this.includeDefaults = false;
         }
 
+        /**
+         * NB prior to 9.0 get-component was a TransportMasterNodeReadAction so for BwC we must remain able to read these requests until
+         * we no longer need to support calling this action remotely.
+         */
+        @UpdateForV10(owner = UpdateForV10.Owner.DATA_MANAGEMENT)
         public Request(StreamInput in) throws IOException {
             super(in);
             name = in.readOptionalString();
@@ -70,17 +76,13 @@ public class GetComponentTemplateAction extends ActionType<GetComponentTemplateA
         }
 
         @Override
-        public void writeTo(StreamOutput out) throws IOException {
-            super.writeTo(out);
-            out.writeOptionalString(name);
-            if (out.getTransportVersion().onOrAfter(TransportVersions.V_8_9_X)) {
-                out.writeBoolean(includeDefaults);
-            }
+        public ActionRequestValidationException validate() {
+            return null;
         }
 
         @Override
-        public ActionRequestValidationException validate() {
-            return null;
+        public Task createTask(long id, String type, String action, TaskId parentTaskId, Map<String, String> headers) {
+            return new CancellableTask(id, type, action, "", parentTaskId, headers);
         }
 
         /**
@@ -123,19 +125,6 @@ public class GetComponentTemplateAction extends ActionType<GetComponentTemplateA
         @Nullable
         private final RolloverConfiguration rolloverConfiguration;
 
-        public Response(StreamInput in) throws IOException {
-            super(in);
-            componentTemplates = in.readMap(ComponentTemplate::new);
-            if (in.getTransportVersion().onOrAfter(TransportVersions.V_8_9_X)) {
-                rolloverConfiguration = in.readOptionalWriteable(RolloverConfiguration::new);
-            } else {
-                rolloverConfiguration = null;
-            }
-            if (in.getTransportVersion().between(TransportVersions.V_8_14_0, TransportVersions.V_8_16_0)) {
-                in.readOptionalWriteable(DataStreamGlobalRetention::read);
-            }
-        }
-
         /**
          * Please use {@link GetComponentTemplateAction.Response#Response(Map)}
          */
@@ -183,6 +172,11 @@ public class GetComponentTemplateAction extends ActionType<GetComponentTemplateA
             return null;
         }
 
+        /**
+         * NB prior to 9.0 get-component was a TransportMasterNodeReadAction so for BwC we must remain able to write these responses until
+         * we no longer need to support calling this action remotely.
+         */
+        @UpdateForV10(owner = UpdateForV10.Owner.DATA_MANAGEMENT)
         @Override
         public void writeTo(StreamOutput out) throws IOException {
             out.writeMap(componentTemplates, StreamOutput::writeWriteable);

server/src/main/java/org/elasticsearch/action/admin/indices/template/get/TransportGetComponentTemplateAction.java

@@ -12,55 +12,65 @@ package org.elasticsearch.action.admin.indices.template.get;
 import org.elasticsearch.ResourceNotFoundException;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.support.ActionFilters;
-import org.elasticsearch.action.support.master.TransportMasterNodeReadProjectAction;
+import org.elasticsearch.action.support.ChannelActionListener;
+import org.elasticsearch.action.support.local.TransportLocalClusterStateAction;
 import org.elasticsearch.cluster.ClusterState;
-import org.elasticsearch.cluster.ProjectState;
 import org.elasticsearch.cluster.block.ClusterBlockException;
 import org.elasticsearch.cluster.block.ClusterBlockLevel;
 import org.elasticsearch.cluster.metadata.ComponentTemplate;
 import org.elasticsearch.cluster.metadata.DataStreamLifecycle;
-import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
 import org.elasticsearch.cluster.project.ProjectResolver;
 import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.regex.Regex;
 import org.elasticsearch.common.settings.ClusterSettings;
 import org.elasticsearch.common.util.concurrent.EsExecutors;
+import org.elasticsearch.core.UpdateForV10;
 import org.elasticsearch.injection.guice.Inject;
+import org.elasticsearch.tasks.CancellableTask;
 import org.elasticsearch.tasks.Task;
-import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.TransportService;
 
 import java.util.HashMap;
 import java.util.Map;
 
-public class TransportGetComponentTemplateAction extends TransportMasterNodeReadProjectAction<
+public class TransportGetComponentTemplateAction extends TransportLocalClusterStateAction<
     GetComponentTemplateAction.Request,
     GetComponentTemplateAction.Response> {
 
     private final ClusterSettings clusterSettings;
+    private final ProjectResolver projectResolver;
 
+    /**
+     * NB prior to 9.0 this was a TransportMasterNodeReadAction so for BwC it must be registered with the TransportService until
+     * we no longer need to support calling this action remotely.
+     */
+    @UpdateForV10(owner = UpdateForV10.Owner.DATA_MANAGEMENT)
+    @SuppressWarnings("this-escape")
     @Inject
     public TransportGetComponentTemplateAction(
         TransportService transportService,
         ClusterService clusterService,
-        ThreadPool threadPool,
         ActionFilters actionFilters,
-        IndexNameExpressionResolver indexNameExpressionResolver,
         ProjectResolver projectResolver
     ) {
         super(
             GetComponentTemplateAction.NAME,
-            transportService,
-            clusterService,
-            threadPool,
             actionFilters,
-            GetComponentTemplateAction.Request::new,
-            projectResolver,
-            indexNameExpressionResolver,
-            GetComponentTemplateAction.Response::new,
+            transportService.getTaskManager(),
+            clusterService,
             EsExecutors.DIRECT_EXECUTOR_SERVICE
         );
         clusterSettings = clusterService.getClusterSettings();
+        this.projectResolver = projectResolver;
+
+        transportService.registerRequestHandler(
+            actionName,
+            executor,
+            false,
+            true,
+            GetComponentTemplateAction.Request::new,
+            (request, channel, task) -> executeDirect(task, request, new ChannelActionListener<>(channel))
+        );
     }
 
     @Override
@@ -69,13 +79,14 @@ public class TransportGetComponentTemplateAction extends TransportMasterNodeRead
     }
 
     @Override
-    protected void masterOperation(
+    protected void localClusterStateOperation(
         Task task,
         GetComponentTemplateAction.Request request,
-        ProjectState projectState,
+        ClusterState clusterState,
         ActionListener<GetComponentTemplateAction.Response> listener
     ) {
-        Map<String, ComponentTemplate> allTemplates = projectState.metadata().componentTemplates();
+        final var cancellableTask = (CancellableTask) task;
+        Map<String, ComponentTemplate> allTemplates = projectResolver.getProjectMetadata(clusterState).componentTemplates();
         Map<String, ComponentTemplate> results;
 
         // If we did not ask for a specific name, then we return all templates
@@ -97,6 +108,7 @@ public class TransportGetComponentTemplateAction extends TransportMasterNodeRead
 
             }
         }
+        cancellableTask.ensureNotCancelled();
         if (request.includeDefaults()) {
             listener.onResponse(
                 new GetComponentTemplateAction.Response(

server/src/main/java/org/elasticsearch/action/bulk/BulkFeatures.java

@@ -15,6 +15,7 @@ import org.elasticsearch.features.NodeFeature;
 import java.util.Set;
 
 import static org.elasticsearch.action.bulk.TransportSimulateBulkAction.SIMULATE_COMPONENT_TEMPLATE_SUBSTITUTIONS;
+import static org.elasticsearch.action.bulk.TransportSimulateBulkAction.SIMULATE_IGNORED_FIELDS;
 import static org.elasticsearch.action.bulk.TransportSimulateBulkAction.SIMULATE_INDEX_TEMPLATE_SUBSTITUTIONS;
 import static org.elasticsearch.action.bulk.TransportSimulateBulkAction.SIMULATE_MAPPING_ADDITION;
 import static org.elasticsearch.action.bulk.TransportSimulateBulkAction.SIMULATE_MAPPING_VALIDATION;
@@ -29,7 +30,8 @@ public class BulkFeatures implements FeatureSpecification {
             SIMULATE_COMPONENT_TEMPLATE_SUBSTITUTIONS,
             SIMULATE_INDEX_TEMPLATE_SUBSTITUTIONS,
             SIMULATE_MAPPING_ADDITION,
-            SIMULATE_SUPPORT_NON_TEMPLATE_MAPPING
+            SIMULATE_SUPPORT_NON_TEMPLATE_MAPPING,
+            SIMULATE_IGNORED_FIELDS
         );
     }
 }

server/src/main/java/org/elasticsearch/action/bulk/TransportSimulateBulkAction.java

@@ -9,6 +9,8 @@
 
 package org.elasticsearch.action.bulk;
 
+import org.apache.lucene.document.StringField;
+import org.apache.lucene.index.IndexableField;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.DocWriteRequest;
 import org.elasticsearch.action.admin.indices.template.post.TransportSimulateIndexTemplateAction;
@@ -35,6 +37,7 @@ import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.AtomicArray;
 import org.elasticsearch.common.xcontent.XContentHelper;
 import org.elasticsearch.core.Nullable;
+import org.elasticsearch.core.Tuple;
 import org.elasticsearch.features.NodeFeature;
 import org.elasticsearch.index.IndexSettingProvider;
 import org.elasticsearch.index.IndexSettingProviders;
@@ -42,6 +45,8 @@ import org.elasticsearch.index.IndexVersion;
 import org.elasticsearch.index.IndexingPressure;
 import org.elasticsearch.index.VersionType;
 import org.elasticsearch.index.engine.Engine;
+import org.elasticsearch.index.mapper.IgnoredFieldMapper;
+import org.elasticsearch.index.mapper.LuceneDocument;
 import org.elasticsearch.index.mapper.MapperService;
 import org.elasticsearch.index.mapper.SourceToParse;
 import org.elasticsearch.index.seqno.SequenceNumbers;
@@ -62,6 +67,7 @@ import org.elasticsearch.xcontent.XContentParserConfiguration;
 import org.elasticsearch.xcontent.XContentType;
 
 import java.io.IOException;
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -87,6 +93,7 @@ public class TransportSimulateBulkAction extends TransportAbstractBulkAction {
     public static final NodeFeature SIMULATE_INDEX_TEMPLATE_SUBSTITUTIONS = new NodeFeature("simulate.index.template.substitutions");
     public static final NodeFeature SIMULATE_MAPPING_ADDITION = new NodeFeature("simulate.mapping.addition");
     public static final NodeFeature SIMULATE_SUPPORT_NON_TEMPLATE_MAPPING = new NodeFeature("simulate.support.non.template.mapping");
+    public static final NodeFeature SIMULATE_IGNORED_FIELDS = new NodeFeature("simulate.ignored.fields");
     private final IndicesService indicesService;
     private final NamedXContentRegistry xContentRegistry;
     private final Set<IndexSettingProvider> indexSettingProviders;
@@ -141,12 +148,13 @@ public class TransportSimulateBulkAction extends TransportAbstractBulkAction {
             DocWriteRequest<?> docRequest = bulkRequest.requests.get(i);
             assert docRequest instanceof IndexRequest : "TransportSimulateBulkAction should only ever be called with IndexRequests";
             IndexRequest request = (IndexRequest) docRequest;
-            Exception mappingValidationException = validateMappings(
+            Tuple<Collection<String>, Exception> validationResult = validateMappings(
                 componentTemplateSubstitutions,
                 indexTemplateSubstitutions,
                 mappingAddition,
                 request
             );
+            Exception mappingValidationException = validationResult.v2();
             responses.set(
                 i,
                 BulkItemResponse.success(
@@ -159,6 +167,7 @@ public class TransportSimulateBulkAction extends TransportAbstractBulkAction {
                         request.source(),
                         request.getContentType(),
                         request.getExecutedPipelines(),
+                        validationResult.v1(),
                         mappingValidationException
                     )
                 )
@@ -172,11 +181,12 @@ public class TransportSimulateBulkAction extends TransportAbstractBulkAction {
     /**
      * This creates a temporary index with the mappings of the index in the request, and then attempts to index the source from the request
      * into it. If there is a mapping exception, that exception is returned. On success the returned exception is null.
-     * @parem componentTemplateSubstitutions The component template definitions to use in place of existing ones for validation
+     * @param componentTemplateSubstitutions The component template definitions to use in place of existing ones for validation
      * @param request The IndexRequest whose source will be validated against the mapping (if it exists) of its index
-     * @return a mapping exception if the source does not match the mappings, otherwise null
+     * @return a Tuple containing: (1) in v1 the names of any fields that would be ignored upon indexing and (2) in v2 the mapping
+     * exception if the source does not match the mappings, otherwise null
      */
-    private Exception validateMappings(
+    private Tuple<Collection<String>, Exception> validateMappings(
         Map<String, ComponentTemplate> componentTemplateSubstitutions,
         Map<String, ComposableIndexTemplate> indexTemplateSubstitutions,
         Map<String, Object> mappingAddition,
@@ -194,6 +204,7 @@ public class TransportSimulateBulkAction extends TransportAbstractBulkAction {
         ClusterState state = clusterService.state();
         ProjectMetadata project = state.metadata().getProject();
         Exception mappingValidationException = null;
+        Collection<String> ignoredFields = List.of();
         IndexAbstraction indexAbstraction = project.getIndicesLookup().get(request.index());
         try {
             if (indexAbstraction != null
@@ -280,7 +291,7 @@ public class TransportSimulateBulkAction extends TransportAbstractBulkAction {
                     );
                     CompressedXContent mappings = template.mappings();
                     CompressedXContent mergedMappings = mergeMappings(mappings, mappingAddition);
-                    validateUpdatedMappings(mappings, mergedMappings, request, sourceToParse);
+                    ignoredFields = validateUpdatedMappings(mappings, mergedMappings, request, sourceToParse);
                 } else {
                     List<IndexTemplateMetadata> matchingTemplates = findV1Templates(
                         simulatedState.metadata().getProject(),
@@ -298,7 +309,7 @@ public class TransportSimulateBulkAction extends TransportAbstractBulkAction {
                             xContentRegistry
                         );
                         final CompressedXContent combinedMappings = mergeMappings(new CompressedXContent(mappingsMap), mappingAddition);
-                        validateUpdatedMappings(null, combinedMappings, request, sourceToParse);
+                        ignoredFields = validateUpdatedMappings(null, combinedMappings, request, sourceToParse);
                     } else if (indexAbstraction != null && mappingAddition.isEmpty() == false) {
                         /*
                          * The index matched no templates of any kind, including the substitutions. But it might have a mapping. So we
@@ -311,7 +322,7 @@ public class TransportSimulateBulkAction extends TransportAbstractBulkAction {
                             .mapping();
                         CompressedXContent currentIndexCompressedXContent = mappingFromIndex == null ? null : mappingFromIndex.source();
                         CompressedXContent combinedMappings = mergeMappings(currentIndexCompressedXContent, mappingAddition);
-                        validateUpdatedMappings(null, combinedMappings, request, sourceToParse);
+                        ignoredFields = validateUpdatedMappings(null, combinedMappings, request, sourceToParse);
                     } else {
                         /*
                          * The index matched no templates and had no mapping of its own. If there were component template substitutions
@@ -319,27 +330,28 @@ public class TransportSimulateBulkAction extends TransportAbstractBulkAction {
                          * and validate.
                          */
                         final CompressedXContent combinedMappings = mergeMappings(null, mappingAddition);
-                        validateUpdatedMappings(null, combinedMappings, request, sourceToParse);
+                        ignoredFields = validateUpdatedMappings(null, combinedMappings, request, sourceToParse);
                     }
                 }
             }
         } catch (Exception e) {
             mappingValidationException = e;
         }
-        return mappingValidationException;
+        return Tuple.tuple(ignoredFields, mappingValidationException);
     }
 
     /*
-     * Validates that when updatedMappings are applied
+     * Validates that when updatedMappings are applied. If any fields would be ignored while indexing, then those field names are returned.
+     * Otherwise the returned Collection is empty.
      */
-    private void validateUpdatedMappings(
+    private Collection<String> validateUpdatedMappings(
         @Nullable CompressedXContent originalMappings,
         @Nullable CompressedXContent updatedMappings,
         IndexRequest request,
         SourceToParse sourceToParse
     ) throws IOException {
         if (updatedMappings == null) {
-            return; // no validation to do
+            return List.of(); // no validation to do
         }
         Settings dummySettings = Settings.builder()
             .put(IndexMetadata.SETTING_VERSION_CREATED, IndexVersion.current())
@@ -356,7 +368,7 @@ public class TransportSimulateBulkAction extends TransportAbstractBulkAction {
             .settings(dummySettings)
             .putMapping(new MappingMetadata(updatedMappings))
             .build();
-        indicesService.withTempIndexService(originalIndexMetadata, indexService -> {
+        Engine.Index result = indicesService.withTempIndexService(originalIndexMetadata, indexService -> {
             indexService.mapperService().merge(updatedIndexMetadata, MapperService.MergeReason.MAPPING_UPDATE);
             return IndexShard.prepareIndex(
                 indexService.mapperService(),
@@ -373,6 +385,24 @@ public class TransportSimulateBulkAction extends TransportAbstractBulkAction {
                 0
             );
         });
+        final Collection<String> ignoredFields;
+        if (result == null) {
+            ignoredFields = List.of();
+        } else {
+            List<LuceneDocument> luceneDocuments = result.parsedDoc().docs();
+            assert luceneDocuments == null || luceneDocuments.size() == 1 : "Expected a single lucene document from index attempt";
+            if (luceneDocuments != null && luceneDocuments.size() == 1) {
+                ignoredFields = luceneDocuments.getFirst()
+                    .getFields()
+                    .stream()
+                    .filter(field -> field.name().equals(IgnoredFieldMapper.NAME) && field instanceof StringField)
+                    .map(IndexableField::stringValue)
+                    .toList();
+            } else {
+                ignoredFields = List.of();
+            }
+        }
+        return ignoredFields;
     }
 
     private static CompressedXContent mergeMappings(@Nullable CompressedXContent originalMapping, Map<String, Object> mappingAddition)

server/src/main/java/org/elasticsearch/action/ingest/SimulateIndexResponse.java

@@ -24,6 +24,7 @@ import org.elasticsearch.xcontent.XContentBuilder;
 import org.elasticsearch.xcontent.XContentType;
 
 import java.io.IOException;
+import java.util.Collection;
 import java.util.List;
 
 /**
@@ -34,6 +35,7 @@ import java.util.List;
 public class SimulateIndexResponse extends IndexResponse {
     private final BytesReference source;
     private final XContentType sourceXContentType;
+    private final Collection<String> ignoredFields;
     private final Exception exception;
 
     @SuppressWarnings("this-escape")
@@ -47,6 +49,11 @@ public class SimulateIndexResponse extends IndexResponse {
         } else {
             this.exception = null;
         }
+        if (in.getTransportVersion().onOrAfter(TransportVersions.SIMULATE_IGNORED_FIELDS)) {
+            this.ignoredFields = in.readStringCollectionAsList();
+        } else {
+            this.ignoredFields = List.of();
+        }
     }
 
     @SuppressWarnings("this-escape")
@@ -57,6 +64,7 @@ public class SimulateIndexResponse extends IndexResponse {
         BytesReference source,
         XContentType sourceXContentType,
         List<String> pipelines,
+        Collection<String> ignoredFields,
         @Nullable Exception exception
     ) {
         // We don't actually care about most of the IndexResponse fields:
@@ -73,6 +81,7 @@ public class SimulateIndexResponse extends IndexResponse {
         this.source = source;
         this.sourceXContentType = sourceXContentType;
         setShardInfo(ShardInfo.EMPTY);
+        this.ignoredFields = ignoredFields;
         this.exception = exception;
     }
 
@@ -84,6 +93,16 @@ public class SimulateIndexResponse extends IndexResponse {
         builder.field("_source", XContentHelper.convertToMap(source, false, sourceXContentType).v2());
         assert executedPipelines != null : "executedPipelines is null when it shouldn't be - we always list pipelines in simulate mode";
         builder.array("executed_pipelines", executedPipelines.toArray());
+        if (ignoredFields.isEmpty() == false) {
+            builder.startArray("ignored_fields");
+            for (String ignoredField : ignoredFields) {
+                builder.startObject();
+                builder.field("field", ignoredField);
+                builder.endObject();
+            }
+            ;
+            builder.endArray();
+        }
         if (exception != null) {
             builder.startObject("error");
             ElasticsearchException.generateThrowableXContent(builder, params, exception);
@@ -105,6 +124,9 @@ public class SimulateIndexResponse extends IndexResponse {
         if (out.getTransportVersion().onOrAfter(TransportVersions.V_8_15_0)) {
             out.writeException(exception);
         }
+        if (out.getTransportVersion().onOrAfter(TransportVersions.SIMULATE_IGNORED_FIELDS)) {
+            out.writeStringCollection(ignoredFields);
+        }
     }
 
     public Exception getException() {

server/src/main/java/org/elasticsearch/action/search/SearchPhaseExecutionException.java

@@ -73,15 +73,21 @@ public class SearchPhaseExecutionException extends ElasticsearchException {
             // on coordinator node. so get the status from cause instead of returning SERVICE_UNAVAILABLE blindly
             return getCause() == null ? RestStatus.SERVICE_UNAVAILABLE : ExceptionsHelper.status(getCause());
         }
-        RestStatus status = shardFailures[0].status();
-        if (shardFailures.length > 1) {
-            for (int i = 1; i < shardFailures.length; i++) {
-                if (shardFailures[i].status().getStatus() >= RestStatus.INTERNAL_SERVER_ERROR.getStatus()) {
-                    status = shardFailures[i].status();
+        RestStatus status = null;
+        for (ShardSearchFailure shardFailure : shardFailures) {
+            RestStatus shardStatus = shardFailure.status();
+            int statusCode = shardStatus.getStatus();
+
+            // Return if it's an error that can be retried.
+            // These currently take precedence over other status code(s).
+            if (statusCode >= 502 && statusCode <= 504) {
+                return shardStatus;
+            } else if (statusCode >= 500) {
+                status = shardStatus;
             }
         }
-        }
-        return status;
+
+        return status == null ? shardFailures[0].status() : status;
     }
 
     public ShardSearchFailure[] shardFailures() {

server/src/main/java/org/elasticsearch/action/support/local/LocalClusterStateRequest.java

@@ -9,10 +9,13 @@
 
 package org.elasticsearch.action.support.local;
 
+import org.elasticsearch.TransportVersions;
 import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.support.TransportAction;
+import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.core.TimeValue;
+import org.elasticsearch.core.UpdateForV10;
 
 import java.io.IOException;
 import java.util.Objects;
@@ -32,6 +35,20 @@ public abstract class LocalClusterStateRequest extends ActionRequest {
         this.masterTimeout = Objects.requireNonNull(masterTimeout);
     }
 
+    /**
+     * This constructor exists solely for BwC purposes. It should exclusively be used by requests that used to extend
+     * {@link org.elasticsearch.action.support.master.MasterNodeReadRequest} and still need to be able to serialize incoming request.
+     */
+    @UpdateForV10(owner = UpdateForV10.Owner.DISTRIBUTED_COORDINATION)
+    protected LocalClusterStateRequest(StreamInput in) throws IOException {
+        super(in);
+        masterTimeout = in.readTimeValue();
+        if (in.getTransportVersion().onOrAfter(TransportVersions.V_8_15_0)) {
+            in.readVLong();
+        }
+        in.readBoolean();
+    }
+
     @Override
     public final void writeTo(StreamOutput out) throws IOException {
         TransportAction.localOnly();

server/src/main/java/org/elasticsearch/inference/UnifiedCompletionRequest.java

@@ -122,7 +122,12 @@ public record UnifiedCompletionRequest(
         );
 
         static {
-            PARSER.declareField(constructorArg(), (p, c) -> parseContent(p), new ParseField("content"), ObjectParser.ValueType.VALUE_ARRAY);
+            PARSER.declareField(
+                optionalConstructorArg(),
+                (p, c) -> parseContent(p),
+                new ParseField("content"),
+                ObjectParser.ValueType.VALUE_ARRAY
+            );
             PARSER.declareString(constructorArg(), new ParseField("role"));
             PARSER.declareString(optionalConstructorArg(), new ParseField("name"));
             PARSER.declareString(optionalConstructorArg(), new ParseField("tool_call_id"));
@@ -143,7 +148,7 @@ public record UnifiedCompletionRequest(
 
         public Message(StreamInput in) throws IOException {
             this(
-                in.readNamedWriteable(Content.class),
+                in.readOptionalNamedWriteable(Content.class),
                 in.readString(),
                 in.readOptionalString(),
                 in.readOptionalString(),
@@ -153,7 +158,7 @@ public record UnifiedCompletionRequest(
 
         @Override
         public void writeTo(StreamOutput out) throws IOException {
-            out.writeNamedWriteable(content);
+            out.writeOptionalNamedWriteable(content);
             out.writeString(role);
             out.writeOptionalString(name);
             out.writeOptionalString(toolCallId);

server/src/main/java/org/elasticsearch/rest/RestUtils.java

@@ -9,11 +9,16 @@
 
 package org.elasticsearch.rest;
 
+import org.elasticsearch.action.support.local.TransportLocalClusterStateAction;
 import org.elasticsearch.action.support.master.AcknowledgedRequest;
 import org.elasticsearch.common.Strings;
+import org.elasticsearch.common.logging.DeprecationCategory;
+import org.elasticsearch.common.logging.DeprecationLogger;
 import org.elasticsearch.core.Booleans;
 import org.elasticsearch.core.Nullable;
+import org.elasticsearch.core.RestApiVersion;
 import org.elasticsearch.core.TimeValue;
+import org.elasticsearch.core.UpdateForV10;
 
 import java.net.URI;
 import java.nio.charset.Charset;
@@ -323,4 +328,23 @@ public class RestUtils {
         assert restRequest != null;
         return restRequest.paramAsTime(REST_TIMEOUT_PARAM, null);
     }
+
+    // Remove the BWC support for the deprecated ?local parameter.
+    // NOTE: ensure each usage of this method has been deprecated for long enough to remove it.
+    @UpdateForV10(owner = UpdateForV10.Owner.DISTRIBUTED_COORDINATION)
+    public static void consumeDeprecatedLocalParameter(RestRequest request) {
+        if (request.hasParam("local") == false) {
+            return;
+        }
+        // Consume this param just for validation when in BWC mode.
+        final var local = request.paramAsBoolean("local", false);
+        if (request.getRestApiVersion() != RestApiVersion.V_8) {
+            DeprecationLogger.getLogger(TransportLocalClusterStateAction.class)
+                .critical(
+                    DeprecationCategory.API,
+                    "TransportLocalClusterStateAction-local-parameter",
+                    "the [?local] query parameter to this API has no effect, is now deprecated, and will be removed in a future version"
+                );
+        }
+    }
 }

server/src/main/java/org/elasticsearch/rest/action/admin/indices/RestGetComponentTemplateAction.java

@@ -14,8 +14,10 @@ import org.elasticsearch.client.internal.node.NodeClient;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.rest.BaseRestHandler;
 import org.elasticsearch.rest.RestRequest;
+import org.elasticsearch.rest.RestUtils;
 import org.elasticsearch.rest.Scope;
 import org.elasticsearch.rest.ServerlessScope;
+import org.elasticsearch.rest.action.RestCancellableNodeClient;
 import org.elasticsearch.rest.action.RestToXContentListener;
 
 import java.io.IOException;
@@ -26,11 +28,12 @@ import static org.elasticsearch.rest.RestRequest.Method.GET;
 import static org.elasticsearch.rest.RestRequest.Method.HEAD;
 import static org.elasticsearch.rest.RestStatus.NOT_FOUND;
 import static org.elasticsearch.rest.RestStatus.OK;
-import static org.elasticsearch.rest.RestUtils.getMasterNodeTimeout;
 
 @ServerlessScope(Scope.PUBLIC)
 public class RestGetComponentTemplateAction extends BaseRestHandler {
 
+    private static final Set<String> SUPPORTED_CAPABILITIES = Set.of("local_param_deprecated");
+
     @Override
     public List<Route> routes() {
         return List.of(
@@ -47,18 +50,23 @@ public class RestGetComponentTemplateAction extends BaseRestHandler {
 
     @Override
     public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
-
-        final GetComponentTemplateAction.Request getRequest = new GetComponentTemplateAction.Request(request.param("name"));
+        final GetComponentTemplateAction.Request getRequest = new GetComponentTemplateAction.Request(
+            RestUtils.getMasterNodeTimeout(request),
+            request.param("name")
+        );
         getRequest.includeDefaults(request.paramAsBoolean("include_defaults", false));
-        getRequest.local(request.paramAsBoolean("local", getRequest.local()));
-        getRequest.masterNodeTimeout(getMasterNodeTimeout(request));
+        RestUtils.consumeDeprecatedLocalParameter(request);
 
         final boolean implicitAll = getRequest.name() == null;
 
-        return channel -> client.execute(GetComponentTemplateAction.INSTANCE, getRequest, new RestToXContentListener<>(channel, r -> {
+        return channel -> new RestCancellableNodeClient(client, request.getHttpChannel()).execute(
+            GetComponentTemplateAction.INSTANCE,
+            getRequest,
+            new RestToXContentListener<>(channel, r -> {
                 final boolean templateExists = r.getComponentTemplates().isEmpty() == false;
                 return (templateExists || implicitAll) ? OK : NOT_FOUND;
-        }));
+            })
+        );
     }
 
     @Override
@@ -66,4 +74,8 @@ public class RestGetComponentTemplateAction extends BaseRestHandler {
         return Settings.FORMAT_PARAMS;
     }
 
+    @Override
+    public Set<String> supportedCapabilities() {
+        return SUPPORTED_CAPABILITIES;
+    }
 }

server/src/test/java/org/elasticsearch/action/admin/indices/template/get/GetComponentTemplateResponseTests.java

@@ -19,16 +19,12 @@ import org.elasticsearch.cluster.metadata.ResettableValue;
 import org.elasticsearch.cluster.metadata.Template;
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.compress.CompressedXContent;
-import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
-import org.elasticsearch.common.io.stream.Writeable;
 import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.indices.IndicesModule;
-import org.elasticsearch.test.AbstractWireSerializingTestCase;
+import org.elasticsearch.test.ESTestCase;
 import org.elasticsearch.xcontent.XContentBuilder;
 import org.elasticsearch.xcontent.XContentType;
 
 import java.io.IOException;
-import java.util.HashMap;
 import java.util.Map;
 
 import static org.elasticsearch.cluster.metadata.ComponentTemplateTests.randomAliases;
@@ -37,30 +33,7 @@ import static org.elasticsearch.cluster.metadata.ComponentTemplateTests.randomSe
 import static org.elasticsearch.xcontent.ToXContent.EMPTY_PARAMS;
 import static org.hamcrest.Matchers.containsString;
 
-public class GetComponentTemplateResponseTests extends AbstractWireSerializingTestCase<GetComponentTemplateAction.Response> {
-    @Override
-    protected Writeable.Reader<GetComponentTemplateAction.Response> instanceReader() {
-        return GetComponentTemplateAction.Response::new;
-    }
-
-    @Override
-    protected GetComponentTemplateAction.Response createTestInstance() {
-        return new GetComponentTemplateAction.Response(
-            randomBoolean() ? Map.of() : randomTemplates(),
-            RolloverConfigurationTests.randomRolloverConditions()
-        );
-    }
-
-    @Override
-    protected GetComponentTemplateAction.Response mutateInstance(GetComponentTemplateAction.Response instance) {
-        var templates = instance.getComponentTemplates();
-        var rolloverConditions = instance.getRolloverConfiguration();
-        switch (randomInt(1)) {
-            case 0 -> templates = templates == null ? randomTemplates() : null;
-            case 1 -> rolloverConditions = randomValueOtherThan(rolloverConditions, RolloverConfigurationTests::randomRolloverConditions);
-        }
-        return new GetComponentTemplateAction.Response(templates, rolloverConditions);
-    }
+public class GetComponentTemplateResponseTests extends ESTestCase {
 
     public void testXContentSerializationWithRolloverAndEffectiveRetention() throws IOException {
         Settings settings = null;
@@ -102,17 +75,4 @@ public class GetComponentTemplateResponseTests extends AbstractWireSerializingTe
             }
         }
     }
-
-    @Override
-    protected NamedWriteableRegistry getNamedWriteableRegistry() {
-        return new NamedWriteableRegistry(IndicesModule.getNamedWriteables());
-    }
-
-    private static Map<String, ComponentTemplate> randomTemplates() {
-        Map<String, ComponentTemplate> templates = new HashMap<>();
-        for (int i = 0; i < randomIntBetween(1, 4); i++) {
-            templates.put(randomAlphaOfLength(4), ComponentTemplateTests.randomInstance());
-        }
-        return templates;
-    }
 }

server/src/test/java/org/elasticsearch/action/ingest/SimulateIndexResponseTests.java

@@ -48,6 +48,7 @@ public class SimulateIndexResponseTests extends ESTestCase {
             sourceBytes,
             XContentType.JSON,
             pipelines,
+            List.of(),
             null
         );
 
@@ -79,6 +80,7 @@ public class SimulateIndexResponseTests extends ESTestCase {
             sourceBytes,
             XContentType.JSON,
             pipelines,
+            List.of(),
             new ElasticsearchException("Some failure")
         );
 
@@ -103,6 +105,39 @@ public class SimulateIndexResponseTests extends ESTestCase {
             ),
             Strings.toString(indexResponseWithException)
         );
+
+        SimulateIndexResponse indexResponseWithIgnoredFields = new SimulateIndexResponse(
+            id,
+            index,
+            version,
+            sourceBytes,
+            XContentType.JSON,
+            pipelines,
+            List.of("abc", "def"),
+            null
+        );
+
+        assertEquals(
+            XContentHelper.stripWhitespace(
+                Strings.format(
+                    """
+                        {
+                          "_id": "%s",
+                          "_index": "%s",
+                          "_version": %d,
+                          "_source": %s,
+                          "executed_pipelines": [%s],
+                          "ignored_fields": [{"field": "abc"}, {"field": "def"}]
+                        }""",
+                    id,
+                    index,
+                    version,
+                    source,
+                    pipelines.stream().map(pipeline -> "\"" + pipeline + "\"").collect(Collectors.joining(","))
+                )
+            ),
+            Strings.toString(indexResponseWithIgnoredFields)
+        );
     }
 
     public void testSerialization() throws IOException {
@@ -135,6 +170,7 @@ public class SimulateIndexResponseTests extends ESTestCase {
             sourceBytes,
             xContentType,
             pipelines,
+            randomList(0, 20, () -> randomAlphaOfLength(15)),
             randomBoolean() ? null : new ElasticsearchException("failed")
         );
     }

server/src/test/java/org/elasticsearch/action/search/SearchPhaseExecutionExceptionTests.java

@@ -22,6 +22,7 @@ import org.elasticsearch.indices.InvalidIndexTemplateException;
 import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.search.SearchShardTarget;
 import org.elasticsearch.test.ESTestCase;
+import org.elasticsearch.transport.NodeDisconnectedException;
 import org.elasticsearch.xcontent.ToXContent;
 import org.elasticsearch.xcontent.XContent;
 import org.elasticsearch.xcontent.XContentParser;
@@ -31,6 +32,7 @@ import java.io.IOException;
 
 import static org.hamcrest.CoreMatchers.hasItem;
 import static org.hamcrest.Matchers.hasSize;
+import static org.hamcrest.Matchers.is;
 
 public class SearchPhaseExecutionExceptionTests extends ESTestCase {
 
@@ -168,4 +170,57 @@ public class SearchPhaseExecutionExceptionTests extends ESTestCase {
 
         assertEquals(actual.status(), RestStatus.BAD_REQUEST);
     }
+
+    public void testOnlyWithCodesThatDoNotRequirePrecedence() {
+        int pickedIndex = randomIntBetween(0, 1);
+
+        // Pick one of these exceptions randomly.
+        var searchExceptions = new ElasticsearchException[] {
+            new ElasticsearchException("simulated"),
+            new NodeDisconnectedException(null, "unused message", "unused action", null) };
+
+        // Status codes that map to searchExceptions.
+        var expectedStatusCodes = new RestStatus[] { RestStatus.INTERNAL_SERVER_ERROR, RestStatus.BAD_GATEWAY };
+
+        ShardSearchFailure shardFailure1 = new ShardSearchFailure(
+            searchExceptions[pickedIndex],
+            new SearchShardTarget("nodeID", new ShardId("someIndex", "someUUID", 1), null)
+        );
+
+        ShardSearchFailure shardFailure2 = new ShardSearchFailure(
+            searchExceptions[pickedIndex],
+            new SearchShardTarget("nodeID", new ShardId("someIndex", "someUUID", 2), null)
+        );
+
+        SearchPhaseExecutionException ex = new SearchPhaseExecutionException(
+            "search",
+            "all shards failed",
+            new ShardSearchFailure[] { shardFailure1, shardFailure2 }
+        );
+
+        assertThat(ex.status(), is(expectedStatusCodes[pickedIndex]));
+    }
+
+    public void testWithRetriableCodesThatTakePrecedence() {
+        // Maps to a 500.
+        ShardSearchFailure shardFailure1 = new ShardSearchFailure(
+            new ElasticsearchException("simulated"),
+            new SearchShardTarget("nodeID", new ShardId("someIndex", "someUUID", 1), null)
+        );
+
+        // Maps to a 502.
+        ShardSearchFailure shardFailure2 = new ShardSearchFailure(
+            new NodeDisconnectedException(null, "unused message", "unused action", null),
+            new SearchShardTarget("nodeID", new ShardId("someIndex", "someUUID", 2), null)
+        );
+
+        SearchPhaseExecutionException ex = new SearchPhaseExecutionException(
+            "search",
+            "all shards failed",
+            new ShardSearchFailure[] { shardFailure1, shardFailure2 }
+        );
+
+        // The 502 takes precedence over 500.
+        assertThat(ex.status(), is(RestStatus.BAD_GATEWAY));
+    }
 }

server/src/test/java/org/elasticsearch/rest/action/ingest/RestSimulateIngestActionTests.java

@@ -175,6 +175,14 @@ public class RestSimulateIngestActionTests extends ESTestCase {
                     "executed_pipelines" : [
                       "pipeline1",
                       "pipeline2"
+                    ],
+                    "ignored_fields" : [
+                      {
+                        "field" : "abc"
+                      },
+                      {
+                        "field" : "def"
+                      }
                     ]
                   }
                 },
@@ -199,6 +207,14 @@ public class RestSimulateIngestActionTests extends ESTestCase {
                     "executed_pipelines" : [
                       "pipeline1",
                       "pipeline2"
+                    ],
+                    "ignored_fields" : [
+                      {
+                        "field" : "abc"
+                      },
+                      {
+                        "field" : "def"
+                      }
                     ]
                   }
                 }
@@ -228,6 +244,7 @@ public class RestSimulateIngestActionTests extends ESTestCase {
                 BytesReference.fromByteBuffers(sourceByteBuffer),
                 XContentType.JSON,
                 List.of("pipeline1", "pipeline2"),
+                List.of("abc", "def"),
                 null
             )
         );

test/framework/src/main/java/org/elasticsearch/test/TestCluster.java

@@ -120,7 +120,7 @@ public abstract class TestCluster {
         );
 
         final SubscribableListener<GetComponentTemplateAction.Response> getComponentTemplates = SubscribableListener.newForked(
-            l -> client().execute(GetComponentTemplateAction.INSTANCE, new GetComponentTemplateAction.Request("*"), l)
+            l -> client().execute(GetComponentTemplateAction.INSTANCE, new GetComponentTemplateAction.Request(TEST_REQUEST_TIMEOUT, "*"), l)
         );
 
         SubscribableListener

test/framework/src/main/java/org/elasticsearch/test/rest/ESRestTestCase.java

@@ -852,8 +852,7 @@ public abstract class ESRestTestCase extends ESTestCase {
     }
 
     private void wipeCluster() throws Exception {
-        logger.info("Waiting for all cluster updates up to this moment to be processed");
-        assertOK(adminClient().performRequest(new Request("GET", "_cluster/health?wait_for_events=languid")));
+        waitForClusterUpdates();
 
         // Cleanup rollup before deleting indices. A rollup job might have bulks in-flight,
         // so we need to fully shut them down first otherwise a job might stall waiting
@@ -991,6 +990,38 @@ public abstract class ESRestTestCase extends ESTestCase {
         deleteAllNodeShutdownMetadata();
     }
 
+    private void waitForClusterUpdates() throws Exception {
+        logger.info("Waiting for all cluster updates up to this moment to be processed");
+        try {
+            assertOK(adminClient().performRequest(new Request("GET", "_cluster/health?wait_for_events=languid")));
+        } catch (ResponseException e) {
+            if (e.getResponse().getStatusLine().getStatusCode() == HttpStatus.SC_REQUEST_TIMEOUT) {
+                final var pendingTasks = getPendingClusterStateTasks();
+                if (pendingTasks != null) {
+                    logger.error("Timed out waiting for cluster updates to be processed, {}", pendingTasks);
+                }
+            }
+            throw e;
+        }
+    }
+
+    private static String getPendingClusterStateTasks() {
+        try {
+            Response response = adminClient().performRequest(new Request("GET", "/_cluster/pending_tasks"));
+            List<?> tasks = (List<?>) entityAsMap(response).get("tasks");
+            if (false == tasks.isEmpty()) {
+                StringBuilder message = new StringBuilder("there are still running tasks:");
+                for (Object task : tasks) {
+                    message.append('\n').append(task.toString());
+                }
+                return message.toString();
+            }
+        } catch (IOException e) {
+            fail(e, "Failed to retrieve pending tasks in the cluster during cleanup");
+        }
+        return null;
+    }
+
     /**
      * This method checks whether ILM policies or templates get recreated after they have been deleted. If so, we are probably deleting
      * them unnecessarily, potentially causing test performance problems. This could happen for example if someone adds a new standard ILM
@@ -1461,18 +1492,9 @@ public abstract class ESRestTestCase extends ESTestCase {
      */
     private static void waitForClusterStateUpdatesToFinish() throws Exception {
         assertBusy(() -> {
-            try {
-                Response response = adminClient().performRequest(new Request("GET", "/_cluster/pending_tasks"));
-                List<?> tasks = (List<?>) entityAsMap(response).get("tasks");
-                if (false == tasks.isEmpty()) {
-                    StringBuilder message = new StringBuilder("there are still running tasks:");
-                    for (Object task : tasks) {
-                        message.append('\n').append(task.toString());
-                    }
-                    fail(message.toString());
-                }
-            } catch (IOException e) {
-                fail("cannot get cluster's pending tasks: " + e.getMessage());
+            final var pendingTasks = getPendingClusterStateTasks();
+            if (pendingTasks != null) {
+                fail(pendingTasks);
             }
         }, 30, TimeUnit.SECONDS);
     }

updatecli-compose.yaml

@@ -7,7 +7,7 @@ policies:
       - .github/updatecli/values.d/scm.yml
       - .github/updatecli/values.d/ironbank.yml
   - name: Update Updatecli policies
-    policy: ghcr.io/updatecli/policies/autodiscovery/updatecli:0.6.0@sha256:6bd6999620674b2fbb1d374f7a1a5e9740d042667f0592900b44259f3e1ae98f
+    policy: ghcr.io/updatecli/policies/autodiscovery/updatecli:0.8.0@sha256:99e9e61b501575c2c176c39f2275998d198b590a3f6b1fe829f7315f8d457e7f
     values:
       - .github/updatecli/values.d/scm.yml
       - .github/updatecli/values.d/updatecli-compose.yml

x-pack/build.gradle

@@ -36,7 +36,7 @@ subprojects {
   }
 
   project.pluginManager.withPlugin("elasticsearch.licensing") {
-    ext.projectLicenses.set(['Elastic License 2.0': ext.elasticLicenseUrl.get()])
+    ext.projectLicenses.set(['Elastic License 2.0': ext.elasticLicenseUrl])
   }
 
   project.pluginManager.withPlugin("elasticsearch.build") {

x-pack/plugin/downsample/src/main/java/org/elasticsearch/xpack/downsample/TransportDownsampleAction.java

@@ -59,6 +59,7 @@ import org.elasticsearch.index.IndexMode;
 import org.elasticsearch.index.IndexNotFoundException;
 import org.elasticsearch.index.IndexSettings;
 import org.elasticsearch.index.mapper.DateFieldMapper;
+import org.elasticsearch.index.mapper.FieldMapper;
 import org.elasticsearch.index.mapper.MappedFieldType;
 import org.elasticsearch.index.mapper.MapperService;
 import org.elasticsearch.index.mapper.TimeSeriesParams;
@@ -724,6 +725,9 @@ public class TransportDownsampleAction extends AcknowledgedTransportMasterNodeAc
                     if (mapping.get("format") != null) {
                         builder.field("format", mapping.get("format"));
                     }
+                    if (mapping.get("ignore_malformed") != null) {
+                        builder.field("ignore_malformed", mapping.get("ignore_malformed"));
+                    }
                 }
             } catch (IOException e) {
                 throw new ElasticsearchException("Unable to create timestamp field mapping for field [" + timestampField + "]", e);
@@ -898,6 +902,12 @@ public class TransportDownsampleAction extends AcknowledgedTransportMasterNodeAc
                 sourceIndexMetadata.getSettings().get(MapperService.INDEX_MAPPING_TOTAL_FIELDS_LIMIT_SETTING.getKey())
             );
         }
+        if (sourceIndexMetadata.getSettings().hasValue(FieldMapper.IGNORE_MALFORMED_SETTING.getKey())) {
+            builder.put(
+                FieldMapper.IGNORE_MALFORMED_SETTING.getKey(),
+                sourceIndexMetadata.getSettings().get(FieldMapper.IGNORE_MALFORMED_SETTING.getKey())
+            );
+        }
 
         CreateIndexClusterStateUpdateRequest createIndexClusterStateUpdateRequest = new CreateIndexClusterStateUpdateRequest(
             "downsample",

x-pack/plugin/downsample/src/test/java/org/elasticsearch/xpack/downsample/DownsampleActionSingleNodeTests.java

@@ -49,6 +49,7 @@ import org.elasticsearch.index.IndexService;
 import org.elasticsearch.index.IndexSettings;
 import org.elasticsearch.index.engine.VersionConflictEngineException;
 import org.elasticsearch.index.mapper.DateFieldMapper;
+import org.elasticsearch.index.mapper.FieldMapper;
 import org.elasticsearch.index.mapper.MapperService;
 import org.elasticsearch.index.mapper.TimeSeriesIdFieldMapper;
 import org.elasticsearch.index.mapper.TimeSeriesParams;
@@ -201,14 +202,19 @@ public class DownsampleActionSingleNodeTests extends ESSingleNodeTestCase {
                 IndexSettings.TIME_SERIES_START_TIME.getKey(),
                 DateFieldMapper.DEFAULT_DATE_TIME_FORMATTER.formatMillis(Instant.ofEpochMilli(startTime).toEpochMilli())
             )
-            .put(IndexSettings.TIME_SERIES_END_TIME.getKey(), "2106-01-08T23:40:53.384Z");
+            .put(IndexSettings.TIME_SERIES_END_TIME.getKey(), "2106-01-08T23:40:53.384Z")
+            .put(FieldMapper.IGNORE_MALFORMED_SETTING.getKey(), randomBoolean());
 
         if (randomBoolean()) {
             settings.put(IndexMetadata.SETTING_INDEX_HIDDEN, randomBoolean());
         }
 
         XContentBuilder mapping = jsonBuilder().startObject().startObject("_doc").startObject("properties");
-        mapping.startObject(FIELD_TIMESTAMP).field("type", "date").endObject();
+        mapping.startObject(FIELD_TIMESTAMP).field("type", "date");
+        if (settings.get(FieldMapper.IGNORE_MALFORMED_SETTING.getKey()).equals("true")) {
+            mapping.field("ignore_malformed", false);
+        }
+        mapping.endObject();
 
         // Dimensions
         mapping.startObject(FIELD_DIMENSION_1).field("type", "keyword").field("time_series_dimension", true).endObject();

x-pack/plugin/esql-core/src/test/java/org/elasticsearch/xpack/esql/core/util/TestUtils.java

@@ -15,6 +15,8 @@ import org.elasticsearch.xpack.esql.core.tree.Source;
 import org.elasticsearch.xpack.esql.core.type.DataType;
 import org.elasticsearch.xpack.esql.core.type.EsField;
 
+import java.util.regex.Pattern;
+
 import static java.util.Collections.emptyMap;
 import static org.elasticsearch.test.ESTestCase.randomAlphaOfLength;
 import static org.elasticsearch.test.ESTestCase.randomBoolean;
@@ -26,6 +28,8 @@ import static org.elasticsearch.xpack.esql.core.type.DataType.INTEGER;
 public final class TestUtils {
     private TestUtils() {}
 
+    private static final Pattern WS_PATTERN = Pattern.compile("\\s");
+
     public static Literal of(Object value) {
         return of(Source.EMPTY, value);
     }
@@ -59,4 +63,9 @@ public final class TestUtils {
     public static FieldAttribute getFieldAttribute(String name, DataType dataType) {
         return new FieldAttribute(EMPTY, name, new EsField(name + "f", dataType, emptyMap(), true));
     }
+
+    /** Similar to {@link String#strip()}, but removes the WS throughout the entire string. */
+    public static String stripThrough(String input) {
+        return WS_PATTERN.matcher(input).replaceAll(StringUtils.EMPTY);
+    }
 }

x-pack/plugin/esql/compute/src/main/generated-src/org/elasticsearch/compute/aggregation/ValuesBytesRefAggregator.java

@@ -130,8 +130,20 @@ class ValuesBytesRefAggregator {
         private final BytesRefHash bytes;
 
         private GroupingState(BigArrays bigArrays) {
-            values = new LongLongHash(1, bigArrays);
-            bytes = new BytesRefHash(1, bigArrays);
+            LongLongHash _values = null;
+            BytesRefHash _bytes = null;
+            try {
+                _values = new LongLongHash(1, bigArrays);
+                _bytes = new BytesRefHash(1, bigArrays);
+
+                values = _values;
+                bytes = _bytes;
+
+                _values = null;
+                _bytes = null;
+            } finally {
+                Releasables.closeExpectNoException(_values, _bytes);
+            }
         }
 
         void toIntermediate(Block[] blocks, int offset, IntVector selected, DriverContext driverContext) {

x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/aggregation/X-ValuesAggregator.java.st

@@ -244,8 +244,20 @@ $endif$
 $if(long||double)$
             values = new LongLongHash(1, bigArrays);
 $elseif(BytesRef)$
-            values = new LongLongHash(1, bigArrays);
-            bytes = new BytesRefHash(1, bigArrays);
+            LongLongHash _values = null;
+            BytesRefHash _bytes = null;
+            try {
+                _values = new LongLongHash(1, bigArrays);
+                _bytes = new BytesRefHash(1, bigArrays);
+
+                values = _values;
+                bytes = _bytes;
+
+                _values = null;
+                _bytes = null;
+            } finally {
+                Releasables.closeExpectNoException(_values, _bytes);
+            }
 $elseif(int||float)$
             values = new LongHash(1, bigArrays);
 $endif$

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/aggregation/ValuesBytesRefAggregatorFunctionTests.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.compute.aggregation;
+
+import org.apache.lucene.util.BytesRef;
+import org.elasticsearch.compute.data.Block;
+import org.elasticsearch.compute.data.BlockFactory;
+import org.elasticsearch.compute.data.BlockUtils;
+import org.elasticsearch.compute.operator.SequenceBytesRefBlockSourceOperator;
+import org.elasticsearch.compute.operator.SourceOperator;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.TreeSet;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+import static org.hamcrest.Matchers.containsInAnyOrder;
+
+public class ValuesBytesRefAggregatorFunctionTests extends AggregatorFunctionTestCase {
+    @Override
+    protected SourceOperator simpleInput(BlockFactory blockFactory, int size) {
+        return new SequenceBytesRefBlockSourceOperator(
+            blockFactory,
+            IntStream.range(0, size).mapToObj(l -> new BytesRef(randomAlphaOfLengthBetween(0, 100)))
+        );
+    }
+
+    @Override
+    protected AggregatorFunctionSupplier aggregatorFunction(List<Integer> inputChannels) {
+        return new ValuesBytesRefAggregatorFunctionSupplier(inputChannels);
+    }
+
+    @Override
+    protected String expectedDescriptionOfAggregator() {
+        return "values of bytes";
+    }
+
+    @Override
+    public void assertSimpleOutput(List<Block> input, Block result) {
+        TreeSet<?> set = new TreeSet<>((List<?>) BlockUtils.toJavaObject(result, 0));
+        Object[] values = input.stream()
+            .flatMap(AggregatorFunctionTestCase::allBytesRefs)
+            .collect(Collectors.toSet())
+            .toArray(Object[]::new);
+        if (false == set.containsAll(Arrays.asList(values))) {
+            assertThat(set, containsInAnyOrder(values));
+        }
+    }
+}

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/aggregation/ValuesBytesRefGroupingAggregatorFunctionTests.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.compute.aggregation;
+
+import org.apache.lucene.util.BytesRef;
+import org.elasticsearch.compute.data.Block;
+import org.elasticsearch.compute.data.BlockFactory;
+import org.elasticsearch.compute.data.BlockUtils;
+import org.elasticsearch.compute.data.Page;
+import org.elasticsearch.compute.operator.LongBytesRefTupleBlockSourceOperator;
+import org.elasticsearch.compute.operator.SourceOperator;
+import org.elasticsearch.core.Tuple;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.TreeSet;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+import static org.hamcrest.Matchers.containsInAnyOrder;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.nullValue;
+
+public class ValuesBytesRefGroupingAggregatorFunctionTests extends GroupingAggregatorFunctionTestCase {
+    @Override
+    protected AggregatorFunctionSupplier aggregatorFunction(List<Integer> inputChannels) {
+        return new ValuesBytesRefAggregatorFunctionSupplier(inputChannels);
+    }
+
+    @Override
+    protected String expectedDescriptionOfAggregator() {
+        return "values of bytes";
+    }
+
+    @Override
+    protected SourceOperator simpleInput(BlockFactory blockFactory, int size) {
+        return new LongBytesRefTupleBlockSourceOperator(
+            blockFactory,
+            IntStream.range(0, size).mapToObj(l -> Tuple.tuple(randomLongBetween(0, 4), new BytesRef(randomAlphaOfLengthBetween(0, 100))))
+        );
+    }
+
+    @Override
+    public void assertSimpleGroup(List<Page> input, Block result, int position, Long group) {
+        Object[] values = input.stream().flatMap(p -> allBytesRefs(p, group)).collect(Collectors.toSet()).toArray(Object[]::new);
+        Object resultValue = BlockUtils.toJavaObject(result, position);
+        switch (values.length) {
+            case 0 -> assertThat(resultValue, nullValue());
+            case 1 -> assertThat(resultValue, equalTo(values[0]));
+            default -> {
+                TreeSet<?> set = new TreeSet<>((List<?>) resultValue);
+                if (false == set.containsAll(Arrays.asList(values))) {
+                    assertThat(set, containsInAnyOrder(values));
+                }
+            }
+        }
+    }
+}

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/operator/OperatorTestCase.java

@@ -143,6 +143,7 @@ public abstract class OperatorTestCase extends AnyOperatorTestCase {
 
         DriverContext driverContext = crankyDriverContext();
 
+        Exception exception = null;
         boolean driverStarted = false;
         try {
             Operator operator = simple().get(driverContext);
@@ -150,8 +151,8 @@ public abstract class OperatorTestCase extends AnyOperatorTestCase {
             drive(operator, input.iterator(), driverContext);
             // Either we get lucky and cranky doesn't throw and the test completes or we don't and it throws
         } catch (CircuitBreakingException e) {
-            logger.info("broken", e);
             assertThat(e.getMessage(), equalTo(CrankyCircuitBreakerService.ERROR_MESSAGE));
+            exception = e;
         }
         if (driverStarted == false) {
             // if drive hasn't even started then we need to release the input pages
@@ -159,7 +160,14 @@ public abstract class OperatorTestCase extends AnyOperatorTestCase {
         }
 
         // Note the lack of try/finally here - we're asserting that when the driver throws an exception we clear the breakers.
-        assertThat(inputFactoryContext.breaker().getUsed(), equalTo(0L));
+        long inputUsedBytes = inputFactoryContext.breaker().getUsed();
+        if (inputUsedBytes != 0L) {
+            fail(exception, "Expected no used bytes for input, found: " + inputUsedBytes);
+        }
+        long driverUsedBytes = driverContext.breaker().getUsed();
+        if (driverUsedBytes != 0L) {
+            fail(exception, "Expected no used bytes for driver, found: " + driverUsedBytes);
+        }
     }
 
     /**

x-pack/plugin/esql/qa/security/src/javaRestTest/java/org/elasticsearch/xpack/esql/EsqlSecurityIT.java

@@ -30,6 +30,7 @@ import org.junit.Before;
 import org.junit.ClassRule;
 
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;
@@ -87,9 +88,11 @@ public class EsqlSecurityIT extends ESRestTestCase {
 
     @Before
     public void indexDocuments() throws IOException {
+        Settings lookupSettings = Settings.builder().put("index.mode", "lookup").build();
         String mapping = """
             "properties":{"value": {"type": "double"}, "org": {"type": "keyword"}}
             """;
+
         createIndex("index", Settings.EMPTY, mapping);
         indexDocument("index", 1, 10.0, "sales");
         indexDocument("index", 2, 20.0, "engineering");
@@ -110,6 +113,16 @@ public class EsqlSecurityIT extends ESRestTestCase {
         indexDocument("indexpartial", 2, 40.0, "sales");
         refresh("indexpartial");
 
+        createIndex("lookup-user1", lookupSettings, mapping);
+        indexDocument("lookup-user1", 1, 12.0, "engineering");
+        indexDocument("lookup-user1", 2, 31.0, "sales");
+        refresh("lookup-user1");
+
+        createIndex("lookup-user2", lookupSettings, mapping);
+        indexDocument("lookup-user2", 1, 32.0, "marketing");
+        indexDocument("lookup-user2", 2, 40.0, "sales");
+        refresh("lookup-user2");
+
         if (aliasExists("second-alias") == false) {
             Request aliasRequest = new Request("POST", "_aliases");
             aliasRequest.setJsonEntity("""
@@ -126,6 +139,17 @@ public class EsqlSecurityIT extends ESRestTestCase {
                             }
                           }
                         },
+                        {
+                          "add": {
+                            "alias": "lookup-first-alias",
+                            "index": "lookup-user1",
+                            "filter": {
+                                "term": {
+                                    "org": "sales"
+                                }
+                            }
+                          }
+                        },
                         {
                           "add": {
                             "alias": "second-alias",
@@ -229,22 +253,30 @@ public class EsqlSecurityIT extends ESRestTestCase {
     public void testUnauthorizedIndices() throws IOException {
         ResponseException error;
         error = expectThrows(ResponseException.class, () -> runESQLCommand("user1", "from index-user2 | stats sum(value)"));
+        assertThat(error.getMessage(), containsString("Unknown index [index-user2]"));
         assertThat(error.getResponse().getStatusLine().getStatusCode(), equalTo(400));
 
         error = expectThrows(ResponseException.class, () -> runESQLCommand("user2", "from index-user1 | stats sum(value)"));
+        assertThat(error.getMessage(), containsString("Unknown index [index-user1]"));
         assertThat(error.getResponse().getStatusLine().getStatusCode(), equalTo(400));
 
         error = expectThrows(ResponseException.class, () -> runESQLCommand("alias_user2", "from index-user2 | stats sum(value)"));
+        assertThat(error.getMessage(), containsString("Unknown index [index-user2]"));
         assertThat(error.getResponse().getStatusLine().getStatusCode(), equalTo(400));
 
         error = expectThrows(ResponseException.class, () -> runESQLCommand("metadata1_read2", "from index-user1 | stats sum(value)"));
+        assertThat(error.getMessage(), containsString("Unknown index [index-user1]"));
         assertThat(error.getResponse().getStatusLine().getStatusCode(), equalTo(400));
     }
 
     public void testInsufficientPrivilege() {
-        Exception error = expectThrows(Exception.class, () -> runESQLCommand("metadata1_read2", "FROM index-user1 | STATS sum=sum(value)"));
+        ResponseException error = expectThrows(
+            ResponseException.class,
+            () -> runESQLCommand("metadata1_read2", "FROM index-user1 | STATS sum=sum(value)")
+        );
         logger.info("error", error);
         assertThat(error.getMessage(), containsString("Unknown index [index-user1]"));
+        assertThat(error.getResponse().getStatusLine().getStatusCode(), equalTo(HttpStatus.SC_BAD_REQUEST));
     }
 
     public void testIndexPatternErrorMessageComparison_ESQL_SearchDSL() throws Exception {
@@ -511,6 +543,63 @@ public class EsqlSecurityIT extends ESRestTestCase {
         }
     }
 
+    public void testLookupJoinIndexAllowed() throws Exception {
+        Response resp = runESQLCommand(
+            "metadata1_read2",
+            "ROW x = 40.0 | EVAL value = x | LOOKUP JOIN `lookup-user2` ON value | KEEP x, org"
+        );
+        assertOK(resp);
+        Map<String, Object> respMap = entityAsMap(resp);
+        assertThat(
+            respMap.get("columns"),
+            equalTo(List.of(Map.of("name", "x", "type", "double"), Map.of("name", "org", "type", "keyword")))
+        );
+        assertThat(respMap.get("values"), equalTo(List.of(List.of(40.0, "sales"))));
+
+        // Alias, should find the index and the row
+        resp = runESQLCommand("alias_user1", "ROW x = 31.0 | EVAL value = x | LOOKUP JOIN `lookup-first-alias` ON value | KEEP x, org");
+        assertOK(resp);
+        respMap = entityAsMap(resp);
+        assertThat(
+            respMap.get("columns"),
+            equalTo(List.of(Map.of("name", "x", "type", "double"), Map.of("name", "org", "type", "keyword")))
+        );
+        assertThat(respMap.get("values"), equalTo(List.of(List.of(31.0, "sales"))));
+
+        // Alias, for a row that's filtered out
+        resp = runESQLCommand("alias_user1", "ROW x = 123.0 | EVAL value = x | LOOKUP JOIN `lookup-first-alias` ON value | KEEP x, org");
+        assertOK(resp);
+        respMap = entityAsMap(resp);
+        assertThat(
+            respMap.get("columns"),
+            equalTo(List.of(Map.of("name", "x", "type", "double"), Map.of("name", "org", "type", "keyword")))
+        );
+        assertThat(respMap.get("values"), equalTo(List.of(Arrays.asList(123.0, null))));
+    }
+
+    public void testLookupJoinIndexForbidden() {
+        var resp = expectThrows(
+            ResponseException.class,
+            () -> runESQLCommand("metadata1_read2", "FROM lookup-user2 | EVAL value = 10.0 | LOOKUP JOIN `lookup-user1` ON value | KEEP x")
+        );
+        assertThat(resp.getMessage(), containsString("Unknown index [lookup-user1]"));
+        assertThat(resp.getResponse().getStatusLine().getStatusCode(), equalTo(HttpStatus.SC_BAD_REQUEST));
+
+        resp = expectThrows(
+            ResponseException.class,
+            () -> runESQLCommand("metadata1_read2", "ROW x = 10.0 | EVAL value = x | LOOKUP JOIN `lookup-user1` ON value | KEEP x")
+        );
+        assertThat(resp.getMessage(), containsString("Unknown index [lookup-user1]"));
+        assertThat(resp.getResponse().getStatusLine().getStatusCode(), equalTo(HttpStatus.SC_BAD_REQUEST));
+
+        resp = expectThrows(
+            ResponseException.class,
+            () -> runESQLCommand("alias_user1", "ROW x = 10.0 | EVAL value = x | LOOKUP JOIN `lookup-user1` ON value | KEEP x")
+        );
+        assertThat(resp.getMessage(), containsString("Unknown index [lookup-user1]"));
+        assertThat(resp.getResponse().getStatusLine().getStatusCode(), equalTo(HttpStatus.SC_BAD_REQUEST));
+    }
+
     private void createEnrichPolicy() throws Exception {
         createIndex("songs", Settings.EMPTY, """
             "properties":{"song_id": {"type": "keyword"}, "title": {"type": "keyword"}, "artist": {"type": "keyword"} }

x-pack/plugin/esql/qa/security/src/javaRestTest/resources/roles.yml

@@ -35,15 +35,15 @@ user2:
 metadata1_read2:
   cluster: []
   indices:
-    - names: [ 'index-user1' ]
+    - names: [ 'index-user1', 'lookup-user1' ]
       privileges: [ 'view_index_metadata' ]
-    - names: [ 'index-user2' ]
+    - names: [ 'index-user2', 'lookup-user2' ]
       privileges: [ 'read' ]
 
 alias_user1:
   cluster: []
   indices:
-    - names: [ 'first-alias' ]
+    - names: [ 'first-alias', 'lookup-first-alias' ]
       privileges:
         - read
 

x-pack/plugin/esql/qa/server/mixed-cluster/src/javaRestTest/java/org/elasticsearch/xpack/esql/qa/mixed/MixedClusterEsqlSpecIT.java

@@ -21,7 +21,7 @@ import java.io.IOException;
 import java.util.List;
 
 import static org.elasticsearch.xpack.esql.CsvTestUtils.isEnabled;
-import static org.elasticsearch.xpack.esql.action.EsqlCapabilities.Cap.JOIN_LOOKUP_V8;
+import static org.elasticsearch.xpack.esql.action.EsqlCapabilities.Cap.JOIN_LOOKUP_V9;
 import static org.elasticsearch.xpack.esql.qa.rest.EsqlSpecTestCase.Mode.ASYNC;
 
 public class MixedClusterEsqlSpecIT extends EsqlSpecTestCase {
@@ -96,7 +96,7 @@ public class MixedClusterEsqlSpecIT extends EsqlSpecTestCase {
 
     @Override
     protected boolean supportsIndexModeLookup() throws IOException {
-        return hasCapabilities(List.of(JOIN_LOOKUP_V8.capabilityName()));
+        return hasCapabilities(List.of(JOIN_LOOKUP_V9.capabilityName()));
     }
 
     @Override

x-pack/plugin/esql/qa/server/multi-clusters/src/javaRestTest/java/org/elasticsearch/xpack/esql/ccq/MultiClusterSpecIT.java

@@ -48,7 +48,7 @@ import static org.elasticsearch.xpack.esql.CsvTestsDataLoader.ENRICH_SOURCE_INDI
 import static org.elasticsearch.xpack.esql.EsqlTestUtils.classpathResources;
 import static org.elasticsearch.xpack.esql.action.EsqlCapabilities.Cap.INLINESTATS;
 import static org.elasticsearch.xpack.esql.action.EsqlCapabilities.Cap.INLINESTATS_V2;
-import static org.elasticsearch.xpack.esql.action.EsqlCapabilities.Cap.JOIN_LOOKUP_V8;
+import static org.elasticsearch.xpack.esql.action.EsqlCapabilities.Cap.JOIN_LOOKUP_V9;
 import static org.elasticsearch.xpack.esql.action.EsqlCapabilities.Cap.JOIN_PLANNING_V1;
 import static org.elasticsearch.xpack.esql.action.EsqlCapabilities.Cap.METADATA_FIELDS_REMOTE_TEST;
 import static org.elasticsearch.xpack.esql.qa.rest.EsqlSpecTestCase.Mode.SYNC;
@@ -124,7 +124,7 @@ public class MultiClusterSpecIT extends EsqlSpecTestCase {
         assumeFalse("INLINESTATS not yet supported in CCS", testCase.requiredCapabilities.contains(INLINESTATS.capabilityName()));
         assumeFalse("INLINESTATS not yet supported in CCS", testCase.requiredCapabilities.contains(INLINESTATS_V2.capabilityName()));
         assumeFalse("INLINESTATS not yet supported in CCS", testCase.requiredCapabilities.contains(JOIN_PLANNING_V1.capabilityName()));
-        assumeFalse("LOOKUP JOIN not yet supported in CCS", testCase.requiredCapabilities.contains(JOIN_LOOKUP_V8.capabilityName()));
+        assumeFalse("LOOKUP JOIN not yet supported in CCS", testCase.requiredCapabilities.contains(JOIN_LOOKUP_V9.capabilityName()));
     }
 
     private TestFeatureService remoteFeaturesService() throws IOException {
@@ -283,8 +283,8 @@ public class MultiClusterSpecIT extends EsqlSpecTestCase {
 
     @Override
     protected boolean supportsIndexModeLookup() throws IOException {
-        // CCS does not yet support JOIN_LOOKUP_V8 and clusters falsely report they have this capability
-        // return hasCapabilities(List.of(JOIN_LOOKUP_V8.capabilityName()));
+        // CCS does not yet support JOIN_LOOKUP_V9 and clusters falsely report they have this capability
+        // return hasCapabilities(List.of(JOIN_LOOKUP_V9.capabilityName()));
         return false;
     }
 }

x-pack/plugin/esql/qa/server/src/main/java/org/elasticsearch/xpack/esql/qa/rest/RequestIndexFilteringTestCase.java

@@ -221,7 +221,7 @@ public abstract class RequestIndexFilteringTestCase extends ESRestTestCase {
         assertThat(e.getMessage(), containsString("index_not_found_exception"));
         assertThat(e.getMessage(), containsString("no such index [foo]"));
 
-        if (EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled()) {
+        if (EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled()) {
             e = expectThrows(
                 ResponseException.class,
                 () -> runEsql(timestampFilter("gte", "2020-01-01").query("FROM test1 | LOOKUP JOIN foo ON id1"))

x-pack/plugin/esql/qa/testFixtures/src/main/resources/date.csv-spec

@@ -497,6 +497,7 @@ null
 evalDateParseWithTimezone
 required_capability: date_parse_tz
 row s = "12/Jul/2022:10:24:10 +0900" | eval d = date_parse("dd/MMM/yyyy:HH:mm:ss Z", s);
+warningRegex:Date format \[dd/MMM/yyyy:HH:mm:ss Z\] contains textual field specifiers that could change in JDK 23.*
 
 s:keyword                  | d:datetime
 12/Jul/2022:10:24:10 +0900 | 2022-07-12T01:24:10.000Z
@@ -505,6 +506,7 @@ s:keyword                  | d:datetime
 evalDateParseWithTimezoneCrossingDayBoundary
 required_capability: date_parse_tz
 row s = "12/Jul/2022:08:24:10 +0900" | eval d = date_parse("dd/MMM/yyyy:HH:mm:ss Z", s);
+warningRegex:Date format \[dd/MMM/yyyy:HH:mm:ss Z\] contains textual field specifiers that could change in JDK 23.*
 
 s:keyword                  | d:datetime
 12/Jul/2022:08:24:10 +0900 | 2022-07-11T23:24:10.000Z
@@ -517,6 +519,8 @@ row s1 = "12/Jul/2022:10:24:10 +0900", s2 = "2022/12/07 09:24:10 +0800"
 | eval eq = d1 == d2
 | keep d1, eq
 ;
+warningRegex:Date format \[dd/MMM/yyyy:HH:mm:ss Z\] contains textual field specifiers that could change in JDK 23.*
+warningRegex:Date format \[yyyy/dd/MM HH:mm:ss Z\] contains textual field specifiers that could change in JDK 23.*
 
 d1:datetime              | eq:boolean
 2022-07-12T01:24:10.000Z | true
@@ -529,6 +533,7 @@ row s = "2022/12/07 09:24:10", format="yyyy/dd/MM HH:mm:ss"
 | eval with_tz = date_parse(concat(format, " Z"), concat(s, " +0900"))
 | keep s, no_tz, with_tz
 ;
+warningRegex:Date format \[yyyy/dd/MM HH:mm:ss Z\] contains textual field specifiers that could change in JDK 23.*
 
 s:keyword           | no_tz:datetime           | with_tz:datetime
 2022/12/07 09:24:10 | 2022-07-12T09:24:10.000Z | 2022-07-12T00:24:10.000Z
@@ -543,6 +548,7 @@ row s = "2022/12/07 09:24:10", format="yyyy/dd/MM HH:mm:ss"
 | eval with_tz4 = date_parse(concat(format, " O"), concat(s, " GMT+9"))
 | keep s, with_tz*
 ;
+warningRegex:Date format \[yyyy/dd/MM HH:mm:ss .\] contains textual field specifiers that could change in JDK 23.*
 
 s:keyword           | with_tz1:datetime        | with_tz2:datetime        | with_tz3:datetime        | with_tz4:datetime        
 2022/12/07 09:24:10 | 2022-07-12T00:24:10.000Z | 2022-07-12T00:24:10.000Z | 2022-07-12T00:24:10.000Z | 2022-07-12T00:24:10.000Z

x-pack/plugin/esql/qa/testFixtures/src/main/resources/lookup-join.csv-spec

@@ -8,7 +8,7 @@
 ###############################################
 
 basicOnTheDataNode
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | EVAL language_code = languages
@@ -25,7 +25,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 basicRow
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW language_code = 1
 | LOOKUP JOIN languages_lookup ON language_code
@@ -36,7 +36,7 @@ language_code:integer  | language_name:keyword
 ;
 
 basicOnTheCoordinator
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | SORT emp_no
@@ -53,7 +53,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 subsequentEvalOnTheDataNode
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | EVAL language_code = languages
@@ -71,7 +71,7 @@ emp_no:integer | language_code:integer | language_name:keyword | language_code_x
 ;
 
 subsequentEvalOnTheCoordinator
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | SORT emp_no
@@ -89,7 +89,7 @@ emp_no:integer | language_code:integer | language_name:keyword | language_code_x
 ;
 
 sortEvalBeforeLookup
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | SORT emp_no
@@ -106,7 +106,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 nonUniqueLeftKeyOnTheDataNode
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | WHERE emp_no <= 10030
@@ -130,7 +130,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 nonUniqueRightKeyOnTheDataNode
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | EVAL language_code = emp_no % 10
@@ -150,7 +150,7 @@ emp_no:integer | language_code:integer | language_name:keyword       | country:k
 ;
 
 nonUniqueRightKeyOnTheCoordinator
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | SORT emp_no
@@ -170,7 +170,7 @@ emp_no:integer | language_code:integer | language_name:keyword       | country:k
 ;
 
 nonUniqueRightKeyFromRow
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW language_code = 2
 | LOOKUP JOIN languages_lookup_non_unique_key ON language_code
@@ -183,8 +183,7 @@ language_code:integer | language_name:keyword       | country:keyword
 ;
 
 repeatedIndexOnFrom
-required_capability: join_lookup_v8
-required_capability: join_lookup_repeated_index_from
+required_capability: join_lookup_v9
 
 FROM languages_lookup
 | LOOKUP JOIN languages_lookup ON language_code
@@ -202,7 +201,7 @@ dropAllLookedUpFieldsOnTheDataNode-Ignore
 // Depends on
 // https://github.com/elastic/elasticsearch/issues/118778
 // https://github.com/elastic/elasticsearch/issues/118781
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | EVAL language_code = emp_no % 10
@@ -223,7 +222,7 @@ dropAllLookedUpFieldsOnTheCoordinator-Ignore
 // Depends on
 // https://github.com/elastic/elasticsearch/issues/118778
 // https://github.com/elastic/elasticsearch/issues/118781
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | SORT emp_no
@@ -248,7 +247,7 @@ emp_no:integer
 ###############################################
 
 filterOnLeftSide
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | EVAL language_code = languages
@@ -265,7 +264,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 filterOnRightSide
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | LOOKUP JOIN message_types_lookup ON message
@@ -281,7 +280,7 @@ FROM sample_data
 ;
 
 filterOnRightSideAfterStats
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | LOOKUP JOIN message_types_lookup ON message
@@ -294,7 +293,7 @@ count:long | type:keyword
 ;
 
 filterOnJoinKey
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | EVAL language_code = languages
@@ -309,7 +308,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 filterOnJoinKeyAndRightSide
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | WHERE emp_no < 10006
@@ -326,7 +325,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 filterOnRightSideOnTheCoordinator
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | SORT emp_no
@@ -342,7 +341,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 filterOnJoinKeyOnTheCoordinator
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | SORT emp_no
@@ -358,7 +357,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 filterOnJoinKeyAndRightSideOnTheCoordinator
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | SORT emp_no
@@ -375,7 +374,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 filterOnTheDataNodeThenFilterOnTheCoordinator
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | EVAL language_code = languages
@@ -396,7 +395,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ###########################################################################
 
 nullJoinKeyOnTheDataNode
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | WHERE emp_no < 10004
@@ -413,7 +412,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 mvJoinKeyOnTheDataNode
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | WHERE 10003 < emp_no AND emp_no < 10008
@@ -431,7 +430,7 @@ emp_no:integer | language_code:integer | language_name:keyword
 ;
 
 mvJoinKeyFromRow
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW language_code = [4, 5, 6, 7]
 | LOOKUP JOIN languages_lookup_non_unique_key ON language_code
@@ -444,7 +443,7 @@ language_code:integer | language_name:keyword       | country:keyword
 ;
 
 mvJoinKeyFromRowExpanded
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW language_code = [4, 5, 6, 7, 8]
 | MV_EXPAND language_code
@@ -466,7 +465,7 @@ language_code:integer | language_name:keyword       | country:keyword
 ###########################################################################
 
 joinOnNestedField
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM employees
 | WHERE 10000 < emp_no AND emp_no < 10006
@@ -486,7 +485,7 @@ emp_no:integer | language.id:integer | language.name:text
 
 
 joinOnNestedFieldRow
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW language.code = "EN"
 | LOOKUP JOIN languages_nested_fields ON language.code
@@ -499,7 +498,7 @@ language.id:integer | language.code:keyword | language.name.keyword:keyword
 
 
 joinOnNestedNestedFieldRow
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW language.name.keyword = "English"
 | LOOKUP JOIN languages_nested_fields ON language.name.keyword
@@ -515,7 +514,7 @@ language.id:integer | language.name:text | language.name.keyword:keyword
 ###############################################
 
 lookupIPFromRow
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", right = "right"
 | LOOKUP JOIN clientips_lookup ON client_ip
@@ -526,7 +525,7 @@ left         | 172.21.0.5        | right         | Development
 ;
 
 lookupIPFromKeepRow
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", right = "right"
 | KEEP left, client_ip, right
@@ -538,7 +537,7 @@ left         | 172.21.0.5        | right         | Development
 ;
 
 lookupIPFromRowWithShadowing
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", env = "env", right = "right"
 | LOOKUP JOIN clientips_lookup ON client_ip
@@ -549,7 +548,7 @@ left         | 172.21.0.5        | right         | Development
 ;
 
 lookupIPFromRowWithShadowingKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", env = "env", right = "right"
 | EVAL client_ip = client_ip::keyword
@@ -562,7 +561,7 @@ left         | 172.21.0.5        | right         | Development
 ;
 
 lookupIPFromRowWithShadowingKeepReordered
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", env = "env", right = "right"
 | EVAL client_ip = client_ip::keyword
@@ -575,7 +574,7 @@ right         | Development | 172.21.0.5
 ;
 
 lookupIPFromIndex
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword
@@ -594,7 +593,7 @@ ignoreOrder:true
 ;
 
 lookupIPFromIndexKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword
@@ -614,7 +613,7 @@ ignoreOrder:true
 ;
 
 lookupIPFromIndexKeepKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | KEEP client_ip, event_duration, @timestamp, message
@@ -636,7 +635,7 @@ timestamp:date           | client_ip:keyword | event_duration:long | msg:keyword
 ;
 
 lookupIPFromIndexStats
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword
@@ -652,7 +651,7 @@ count:long | env:keyword
 ;
 
 lookupIPFromIndexStatsKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword
@@ -669,7 +668,7 @@ count:long | env:keyword
 ;
 
 statsAndLookupIPFromIndex
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword
@@ -690,7 +689,7 @@ count:long | client_ip:keyword | env:keyword
 ###############################################
 
 lookupMessageFromRow
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", message = "Connected to 10.1.0.1", right = "right"
 | LOOKUP JOIN message_types_lookup ON message
@@ -701,7 +700,7 @@ left         | Connected to 10.1.0.1 | right         | Success
 ;
 
 lookupMessageFromKeepRow
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", message = "Connected to 10.1.0.1", right = "right"
 | KEEP left, message, right
@@ -713,7 +712,7 @@ left         | Connected to 10.1.0.1 | right         | Success
 ;
 
 lookupMessageFromRowWithShadowing
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", message = "Connected to 10.1.0.1", type = "unknown", right = "right"
 | LOOKUP JOIN message_types_lookup ON message
@@ -724,7 +723,7 @@ left         | Connected to 10.1.0.1 | right         | Success
 ;
 
 lookupMessageFromRowWithShadowingKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", message = "Connected to 10.1.0.1", type = "unknown", right = "right"
 | LOOKUP JOIN message_types_lookup ON message
@@ -736,7 +735,7 @@ left         | Connected to 10.1.0.1 | right         | Success
 ;
 
 lookupMessageFromIndex
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | LOOKUP JOIN message_types_lookup ON message
@@ -754,7 +753,7 @@ ignoreOrder:true
 ;
 
 lookupMessageFromIndexKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | LOOKUP JOIN message_types_lookup ON message
@@ -773,7 +772,7 @@ ignoreOrder:true
 ;
 
 lookupMessageFromIndexKeepKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | KEEP client_ip, event_duration, @timestamp, message
@@ -793,7 +792,7 @@ ignoreOrder:true
 ;
 
 lookupMessageFromIndexKeepReordered
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | LOOKUP JOIN message_types_lookup ON message
@@ -812,7 +811,7 @@ Success      | 172.21.2.162 | 3450233             | Connected to 10.1.0.3
 ;
 
 lookupMessageFromIndexStats
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | LOOKUP JOIN message_types_lookup ON message
@@ -827,7 +826,7 @@ count:long | type:keyword
 ;
 
 lookupMessageFromIndexStatsKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | LOOKUP JOIN message_types_lookup ON message
@@ -843,7 +842,7 @@ count:long | type:keyword
 ;
 
 statsAndLookupMessageFromIndex
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | STATS count = count(message) BY message
@@ -861,7 +860,7 @@ count:long | type:keyword | message:keyword
 ;
 
 lookupMessageFromIndexTwice
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | LOOKUP JOIN message_types_lookup ON message
@@ -883,7 +882,7 @@ ignoreOrder:true
 ;
 
 lookupMessageFromIndexTwiceKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | LOOKUP JOIN message_types_lookup ON message
@@ -906,7 +905,7 @@ ignoreOrder:true
 ;
 
 lookupMessageFromIndexTwiceFullyShadowing
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | LOOKUP JOIN message_types_lookup ON message
@@ -930,7 +929,7 @@ ignoreOrder:true
 ###############################################
 
 lookupIPAndMessageFromRow
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", message = "Connected to 10.1.0.1", right = "right"
 | LOOKUP JOIN clientips_lookup ON client_ip
@@ -942,7 +941,7 @@ left         | 172.21.0.5        | Connected to 10.1.0.1 | right         | Devel
 ;
 
 lookupIPAndMessageFromRowKeepBefore
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", message = "Connected to 10.1.0.1", right = "right"
 | KEEP left, client_ip, message, right
@@ -955,7 +954,7 @@ left         | 172.21.0.5        | Connected to 10.1.0.1 | right         | Devel
 ;
 
 lookupIPAndMessageFromRowKeepBetween
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", message = "Connected to 10.1.0.1", right = "right"
 | LOOKUP JOIN clientips_lookup ON client_ip
@@ -968,7 +967,7 @@ left         | 172.21.0.5        | Connected to 10.1.0.1 | right         | Devel
 ;
 
 lookupIPAndMessageFromRowKeepAfter
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", message = "Connected to 10.1.0.1", right = "right"
 | LOOKUP JOIN clientips_lookup ON client_ip
@@ -981,7 +980,7 @@ left         | 172.21.0.5        | Connected to 10.1.0.1 | right         | Devel
 ;
 
 lookupIPAndMessageFromRowWithShadowing
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", message = "Connected to 10.1.0.1", env = "env", type = "type", right = "right"
 | LOOKUP JOIN clientips_lookup ON client_ip
@@ -993,7 +992,7 @@ left         | 172.21.0.5        | Connected to 10.1.0.1 | right         | Devel
 ;
 
 lookupIPAndMessageFromRowWithShadowingKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", message = "Connected to 10.1.0.1", env = "env", right = "right"
 | EVAL client_ip = client_ip::keyword
@@ -1007,7 +1006,7 @@ left         | 172.21.0.5        | Connected to 10.1.0.1 | right         | Devel
 ;
 
 lookupIPAndMessageFromRowWithShadowingKeepKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", message = "Connected to 10.1.0.1", env = "env", right = "right"
 | EVAL client_ip = client_ip::keyword
@@ -1022,7 +1021,7 @@ left         | 172.21.0.5        | Connected to 10.1.0.1 | right         | Devel
 ;
 
 lookupIPAndMessageFromRowWithShadowingKeepKeepKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", message = "Connected to 10.1.0.1", env = "env", right = "right"
 | EVAL client_ip = client_ip::keyword
@@ -1038,7 +1037,7 @@ left         | 172.21.0.5        | Connected to 10.1.0.1 | right         | Devel
 ;
 
 lookupIPAndMessageFromRowWithShadowingKeepReordered
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 ROW left = "left", client_ip = "172.21.0.5", message = "Connected to 10.1.0.1", env = "env", right = "right"
 | EVAL client_ip = client_ip::keyword
@@ -1052,7 +1051,7 @@ right         | Development  | Success      | 172.21.0.5
 ;
 
 lookupIPAndMessageFromIndex
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword
@@ -1072,7 +1071,7 @@ ignoreOrder:true
 ;
 
 lookupIPAndMessageFromIndexKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword
@@ -1093,7 +1092,7 @@ ignoreOrder:true
 ;
 
 lookupIPAndMessageFromIndexStats
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword
@@ -1111,7 +1110,7 @@ count:long | env:keyword | type:keyword
 ;
 
 lookupIPAndMessageFromIndexStatsKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword
@@ -1130,7 +1129,7 @@ count:long | env:keyword | type:keyword
 ;
 
 statsAndLookupIPAndMessageFromIndex
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword
@@ -1149,7 +1148,7 @@ count:long | client_ip:keyword | message:keyword       | env:keyword | type:keyw
 ;
 
 lookupIPAndMessageFromIndexChainedEvalKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword
@@ -1171,7 +1170,7 @@ ignoreOrder:true
 ;
 
 lookupIPAndMessageFromIndexChainedRenameKeep
-required_capability: join_lookup_v8
+required_capability: join_lookup_v9
 
 FROM sample_data
 | EVAL client_ip = client_ip::keyword

x-pack/plugin/esql/qa/testFixtures/src/main/resources/string.csv-spec

@@ -1231,6 +1231,189 @@ a:keyword           | upper:keyword         | lower:keyword
 π/2 + a + B + Λ ºC  | Π/2 + A + B + Λ ºC    | π/2 + a + b + λ ºc
 ;
 
+equalsToUpperPushedDown#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees
+| where to_upper(first_name) == "GEORGI"
+| keep emp_no, first_name
+;
+
+emp_no:integer  | first_name:keyword
+10001           | Georgi
+;
+
+equalsToUpperNestedPushedDown#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees
+| where to_upper(to_upper(to_lower(first_name))) == "GEORGI"
+| keep emp_no, first_name
+;
+
+emp_no:integer  | first_name:keyword
+10001           | Georgi
+;
+
+negatedEqualsToUpperPushedDown#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees
+| sort emp_no
+| where not(to_upper(first_name) == "GEORGI")
+| keep emp_no, first_name
+| limit 1
+;
+
+emp_no:integer  | first_name:keyword
+10002           | Bezalel
+;
+
+notEqualsToUpperPushedDown#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees
+| sort emp_no
+| where to_upper(first_name) != "GEORGI"
+| keep emp_no, first_name
+| limit 1
+;
+
+emp_no:integer  | first_name:keyword
+10002           | Bezalel
+;
+
+negatedNotEqualsToUpperPushedDown#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees
+| sort emp_no
+| where not(to_upper(first_name) != "GEORGI")
+| keep emp_no, first_name
+| limit 1
+;
+
+emp_no:integer  | first_name:keyword
+10001           | Georgi
+;
+
+equalsToUpperFolded
+from employees
+| where to_upper(first_name) == "Georgi"
+| keep emp_no, first_name
+;
+
+emp_no:integer  | first_name:keyword
+;
+
+negatedEqualsToUpperFolded
+from employees
+| where not(to_upper(first_name) == "Georgi")
+| stats c = count()
+;
+
+c:long
+90
+;
+
+equalsToUpperNullFolded#[skip:-8.16.99, reason:function's type corrected in #114334]
+from employees
+| where to_upper(null) == "Georgi"
+| keep emp_no, first_name
+;
+
+emp_no:integer  | first_name:keyword
+;
+
+equalsNullToUpperFolded
+from employees
+| where to_upper(first_name) == null::keyword
+| keep emp_no, first_name
+;
+
+emp_no:integer  | first_name:keyword
+;
+
+notEqualsToUpperNullFolded#[skip:-8.16.99, reason:function's type corrected in #114334]
+from employees
+| where to_upper(null) != "Georgi"
+| keep emp_no, first_name
+;
+
+emp_no:integer  | first_name:keyword
+;
+
+notEqualsNullToUpperFolded
+from employees
+| where to_upper(first_name) != null::keyword
+| keep emp_no, first_name
+;
+
+emp_no:integer  | first_name:keyword
+;
+
+notEqualsToUpperFolded
+from employees
+| where to_upper(first_name) != "Georgi"
+| stats c = count()
+;
+
+c:long
+90
+;
+
+negatedNotEqualsToUpperFolded
+from employees
+| where not(to_upper(first_name) != "Georgi")
+| stats c = count()
+;
+
+c:long
+0
+;
+
+equalsToLowerPushedDown#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees
+| where to_lower(first_name) == "georgi"
+| keep emp_no, first_name
+;
+
+emp_no:integer  | first_name:keyword
+10001           | Georgi
+;
+
+notEqualsToLowerPushedDown#[skip:-8.12.99, reason:case insensitive operators implemented in v 8.13]
+from employees
+| sort emp_no
+| where to_lower(first_name) != "georgi"
+| keep emp_no, first_name
+| limit 1
+;
+
+emp_no:integer  | first_name:keyword
+10002           | Bezalel
+;
+
+equalsToLowerFolded
+from employees
+| where to_lower(first_name) == "Georgi"
+| keep emp_no, first_name
+;
+
+emp_no:integer  | first_name:keyword
+;
+
+notEqualsToLowerFolded
+from employees
+| where to_lower(first_name) != "Georgi"
+| stats c = count()
+;
+
+c:long
+90
+;
+
+equalsToLowerWithUnico(rn|d)s
+from employees
+| where to_lower(concat(first_name, "🦄🦄")) != "georgi🦄🦄"
+| stats c = count()
+;
+
+// 10 null first names
+c:long
+89
+;
+
 reverse
 required_capability: fn_reverse
 from employees | sort emp_no | eval name_reversed = REVERSE(first_name) | keep emp_no, first_name, name_reversed | limit 1;

x-pack/plugin/esql/src/main/generated/org/elasticsearch/xpack/esql/expression/function/scalar/string/ChangeCaseEvaluator.java

@@ -20,25 +20,28 @@ import org.elasticsearch.core.Releasables;
 import org.elasticsearch.xpack.esql.core.tree.Source;
 
 /**
- * {@link EvalOperator.ExpressionEvaluator} implementation for {@link ToLower}.
+ * {@link EvalOperator.ExpressionEvaluator} implementation for {@link ChangeCase}.
  * This class is generated. Do not edit it.
  */
-public final class ToLowerEvaluator implements EvalOperator.ExpressionEvaluator {
+public final class ChangeCaseEvaluator implements EvalOperator.ExpressionEvaluator {
   private final Source source;
 
   private final EvalOperator.ExpressionEvaluator val;
 
   private final Locale locale;
 
+  private final ChangeCase.Case caseType;
+
   private final DriverContext driverContext;
 
   private Warnings warnings;
 
-  public ToLowerEvaluator(Source source, EvalOperator.ExpressionEvaluator val, Locale locale,
-      DriverContext driverContext) {
+  public ChangeCaseEvaluator(Source source, EvalOperator.ExpressionEvaluator val, Locale locale,
+      ChangeCase.Case caseType, DriverContext driverContext) {
     this.source = source;
     this.val = val;
     this.locale = locale;
+    this.caseType = caseType;
     this.driverContext = driverContext;
   }
 
@@ -68,7 +71,7 @@ public final class ToLowerEvaluator implements EvalOperator.ExpressionEvaluator
           result.appendNull();
           continue position;
         }
-        result.appendBytesRef(ToLower.process(valBlock.getBytesRef(valBlock.getFirstValueIndex(p), valScratch), this.locale));
+        result.appendBytesRef(ChangeCase.process(valBlock.getBytesRef(valBlock.getFirstValueIndex(p), valScratch), this.locale, this.caseType));
       }
       return result.build();
     }
@@ -78,7 +81,7 @@ public final class ToLowerEvaluator implements EvalOperator.ExpressionEvaluator
     try(BytesRefVector.Builder result = driverContext.blockFactory().newBytesRefVectorBuilder(positionCount)) {
       BytesRef valScratch = new BytesRef();
       position: for (int p = 0; p < positionCount; p++) {
-        result.appendBytesRef(ToLower.process(valVector.getBytesRef(p, valScratch), this.locale));
+        result.appendBytesRef(ChangeCase.process(valVector.getBytesRef(p, valScratch), this.locale, this.caseType));
       }
       return result.build();
     }
@@ -86,7 +89,7 @@ public final class ToLowerEvaluator implements EvalOperator.ExpressionEvaluator
 
   @Override
   public String toString() {
-    return "ToLowerEvaluator[" + "val=" + val + ", locale=" + locale + "]";
+    return "ChangeCaseEvaluator[" + "val=" + val + ", locale=" + locale + ", caseType=" + caseType + "]";
   }
 
   @Override
@@ -113,20 +116,24 @@ public final class ToLowerEvaluator implements EvalOperator.ExpressionEvaluator
 
     private final Locale locale;
 
-    public Factory(Source source, EvalOperator.ExpressionEvaluator.Factory val, Locale locale) {
+    private final ChangeCase.Case caseType;
+
+    public Factory(Source source, EvalOperator.ExpressionEvaluator.Factory val, Locale locale,
+        ChangeCase.Case caseType) {
       this.source = source;
       this.val = val;
       this.locale = locale;
+      this.caseType = caseType;
     }
 
     @Override
-    public ToLowerEvaluator get(DriverContext context) {
-      return new ToLowerEvaluator(source, val.get(context), locale, context);
+    public ChangeCaseEvaluator get(DriverContext context) {
+      return new ChangeCaseEvaluator(source, val.get(context), locale, caseType, context);
     }
 
     @Override
     public String toString() {
-      return "ToLowerEvaluator[" + "val=" + val + ", locale=" + locale + "]";
+      return "ChangeCaseEvaluator[" + "val=" + val + ", locale=" + locale + ", caseType=" + caseType + "]";
     }
   }
 }

x-pack/plugin/esql/src/main/generated/org/elasticsearch/xpack/esql/expression/function/scalar/string/ToUpperEvaluator.java

@@ -1,132 +0,0 @@
-// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
-// or more contributor license agreements. Licensed under the Elastic License
-// 2.0; you may not use this file except in compliance with the Elastic License
-// 2.0.
-package org.elasticsearch.xpack.esql.expression.function.scalar.string;
-
-import java.lang.IllegalArgumentException;
-import java.lang.Override;
-import java.lang.String;
-import java.util.Locale;
-import org.apache.lucene.util.BytesRef;
-import org.elasticsearch.compute.data.Block;
-import org.elasticsearch.compute.data.BytesRefBlock;
-import org.elasticsearch.compute.data.BytesRefVector;
-import org.elasticsearch.compute.data.Page;
-import org.elasticsearch.compute.operator.DriverContext;
-import org.elasticsearch.compute.operator.EvalOperator;
-import org.elasticsearch.compute.operator.Warnings;
-import org.elasticsearch.core.Releasables;
-import org.elasticsearch.xpack.esql.core.tree.Source;
-
-/**
- * {@link EvalOperator.ExpressionEvaluator} implementation for {@link ToUpper}.
- * This class is generated. Do not edit it.
- */
-public final class ToUpperEvaluator implements EvalOperator.ExpressionEvaluator {
-  private final Source source;
-
-  private final EvalOperator.ExpressionEvaluator val;
-
-  private final Locale locale;
-
-  private final DriverContext driverContext;
-
-  private Warnings warnings;
-
-  public ToUpperEvaluator(Source source, EvalOperator.ExpressionEvaluator val, Locale locale,
-      DriverContext driverContext) {
-    this.source = source;
-    this.val = val;
-    this.locale = locale;
-    this.driverContext = driverContext;
-  }
-
-  @Override
-  public Block eval(Page page) {
-    try (BytesRefBlock valBlock = (BytesRefBlock) val.eval(page)) {
-      BytesRefVector valVector = valBlock.asVector();
-      if (valVector == null) {
-        return eval(page.getPositionCount(), valBlock);
-      }
-      return eval(page.getPositionCount(), valVector).asBlock();
-    }
-  }
-
-  public BytesRefBlock eval(int positionCount, BytesRefBlock valBlock) {
-    try(BytesRefBlock.Builder result = driverContext.blockFactory().newBytesRefBlockBuilder(positionCount)) {
-      BytesRef valScratch = new BytesRef();
-      position: for (int p = 0; p < positionCount; p++) {
-        if (valBlock.isNull(p)) {
-          result.appendNull();
-          continue position;
-        }
-        if (valBlock.getValueCount(p) != 1) {
-          if (valBlock.getValueCount(p) > 1) {
-            warnings().registerException(new IllegalArgumentException("single-value function encountered multi-value"));
-          }
-          result.appendNull();
-          continue position;
-        }
-        result.appendBytesRef(ToUpper.process(valBlock.getBytesRef(valBlock.getFirstValueIndex(p), valScratch), this.locale));
-      }
-      return result.build();
-    }
-  }
-
-  public BytesRefVector eval(int positionCount, BytesRefVector valVector) {
-    try(BytesRefVector.Builder result = driverContext.blockFactory().newBytesRefVectorBuilder(positionCount)) {
-      BytesRef valScratch = new BytesRef();
-      position: for (int p = 0; p < positionCount; p++) {
-        result.appendBytesRef(ToUpper.process(valVector.getBytesRef(p, valScratch), this.locale));
-      }
-      return result.build();
-    }
-  }
-
-  @Override
-  public String toString() {
-    return "ToUpperEvaluator[" + "val=" + val + ", locale=" + locale + "]";
-  }
-
-  @Override
-  public void close() {
-    Releasables.closeExpectNoException(val);
-  }
-
-  private Warnings warnings() {
-    if (warnings == null) {
-      this.warnings = Warnings.createWarnings(
-              driverContext.warningsMode(),
-              source.source().getLineNumber(),
-              source.source().getColumnNumber(),
-              source.text()
-          );
-    }
-    return warnings;
-  }
-
-  static class Factory implements EvalOperator.ExpressionEvaluator.Factory {
-    private final Source source;
-
-    private final EvalOperator.ExpressionEvaluator.Factory val;
-
-    private final Locale locale;
-
-    public Factory(Source source, EvalOperator.ExpressionEvaluator.Factory val, Locale locale) {
-      this.source = source;
-      this.val = val;
-      this.locale = locale;
-    }
-
-    @Override
-    public ToUpperEvaluator get(DriverContext context) {
-      return new ToUpperEvaluator(source, val.get(context), locale, context);
-    }
-
-    @Override
-    public String toString() {
-      return "ToUpperEvaluator[" + "val=" + val + ", locale=" + locale + "]";
-    }
-  }
-}

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/action/EsqlCapabilities.java

@@ -560,12 +560,7 @@ public class EsqlCapabilities {
         /**
          * LOOKUP JOIN
          */
-        JOIN_LOOKUP_V8(Build.current().isSnapshot()),
-
-        /**
-         * LOOKUP JOIN with the same index as the FROM
-         */
-        JOIN_LOOKUP_REPEATED_INDEX_FROM(JOIN_LOOKUP_V8.isEnabled()),
+        JOIN_LOOKUP_V9(Build.current().isSnapshot()),
 
         /**
          * Fix for https://github.com/elastic/elasticsearch/issues/117054

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/enrich/AbstractLookupService.java

@@ -132,7 +132,6 @@ import java.util.stream.IntStream;
  */
 abstract class AbstractLookupService<R extends AbstractLookupService.Request, T extends AbstractLookupService.TransportRequest> {
     private final String actionName;
-    private final String privilegeName;
     private final ClusterService clusterService;
     private final SearchService searchService;
     private final TransportService transportService;
@@ -143,7 +142,6 @@ abstract class AbstractLookupService<R extends AbstractLookupService.Request, T
 
     AbstractLookupService(
         String actionName,
-        String privilegeName,
         ClusterService clusterService,
         SearchService searchService,
         TransportService transportService,
@@ -152,7 +150,6 @@ abstract class AbstractLookupService<R extends AbstractLookupService.Request, T
         CheckedBiFunction<StreamInput, BlockFactory, T, IOException> readRequest
     ) {
         this.actionName = actionName;
-        this.privilegeName = privilegeName;
         this.clusterService = clusterService;
         this.searchService = searchService;
         this.transportService = transportService;
@@ -237,9 +234,21 @@ abstract class AbstractLookupService<R extends AbstractLookupService.Request, T
         }));
     }
 
+    /**
+     * Get the privilege required to perform the lookup.
+     * <p>
+     *     If null is returned, no privilege check will be performed.
+     * </p>
+     */
+    @Nullable
+    protected abstract String getRequiredPrivilege();
+
     private void hasPrivilege(ActionListener<Void> outListener) {
         final Settings settings = clusterService.getSettings();
-        if (settings.hasValue(XPackSettings.SECURITY_ENABLED.getKey()) == false || XPackSettings.SECURITY_ENABLED.get(settings) == false) {
+        String privilegeName = getRequiredPrivilege();
+        if (privilegeName == null
+            || settings.hasValue(XPackSettings.SECURITY_ENABLED.getKey()) == false
+            || XPackSettings.SECURITY_ENABLED.get(settings) == false) {
             outListener.onResponse(null);
             return;
         }

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/enrich/EnrichLookupService.java

@@ -52,16 +52,7 @@ public class EnrichLookupService extends AbstractLookupService<EnrichLookupServi
         BigArrays bigArrays,
         BlockFactory blockFactory
     ) {
-        super(
-            LOOKUP_ACTION_NAME,
-            ClusterPrivilegeResolver.MONITOR_ENRICH.name(),
-            clusterService,
-            searchService,
-            transportService,
-            bigArrays,
-            blockFactory,
-            TransportRequest::readFrom
-        );
+        super(LOOKUP_ACTION_NAME, clusterService, searchService, transportService, bigArrays, blockFactory, TransportRequest::readFrom);
     }
 
     @Override
@@ -90,6 +81,11 @@ public class EnrichLookupService extends AbstractLookupService<EnrichLookupServi
         };
     }
 
+    @Override
+    protected String getRequiredPrivilege() {
+        return ClusterPrivilegeResolver.MONITOR_ENRICH.name();
+    }
+
     private static void validateTypes(DataType inputDataType, MappedFieldType fieldType) {
         if (fieldType instanceof RangeFieldMapper.RangeFieldType rangeType) {
             // For range policy types, the ENRICH index field type will be one of a list of supported range types,

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/enrich/LookupFromIndexService.java

@@ -23,7 +23,6 @@ import org.elasticsearch.index.shard.ShardId;
 import org.elasticsearch.search.SearchService;
 import org.elasticsearch.tasks.TaskId;
 import org.elasticsearch.transport.TransportService;
-import org.elasticsearch.xpack.core.security.authz.privilege.ClusterPrivilegeResolver;
 import org.elasticsearch.xpack.esql.EsqlIllegalArgumentException;
 import org.elasticsearch.xpack.esql.action.EsqlQueryAction;
 import org.elasticsearch.xpack.esql.core.expression.NamedExpression;
@@ -50,16 +49,7 @@ public class LookupFromIndexService extends AbstractLookupService<LookupFromInde
         BigArrays bigArrays,
         BlockFactory blockFactory
     ) {
-        super(
-            LOOKUP_ACTION_NAME,
-            ClusterPrivilegeResolver.MONITOR_ENRICH.name(), // TODO some other privilege
-            clusterService,
-            searchService,
-            transportService,
-            bigArrays,
-            blockFactory,
-            TransportRequest::readFrom
-        );
+        super(LOOKUP_ACTION_NAME, clusterService, searchService, transportService, bigArrays, blockFactory, TransportRequest::readFrom);
     }
 
     @Override
@@ -83,6 +73,11 @@ public class LookupFromIndexService extends AbstractLookupService<LookupFromInde
         return termQueryList(fieldType, context, inputBlock, inputDataType);
     }
 
+    @Override
+    protected String getRequiredPrivilege() {
+        return null;
+    }
+
     private static void validateTypes(DataType inputDataType, MappedFieldType fieldType) {
         // TODO: consider supporting implicit type conversion as done in ENRICH for some types
         if (fieldType.typeName().equals(inputDataType.typeName()) == false) {

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/string/ChangeCase.java

@@ -0,0 +1,112 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.xpack.esql.expression.function.scalar.string;
+
+import org.apache.lucene.util.BytesRef;
+import org.elasticsearch.common.lucene.BytesRefs;
+import org.elasticsearch.compute.ann.Evaluator;
+import org.elasticsearch.compute.ann.Fixed;
+import org.elasticsearch.compute.operator.EvalOperator;
+import org.elasticsearch.xpack.esql.core.expression.Expression;
+import org.elasticsearch.xpack.esql.core.tree.Source;
+import org.elasticsearch.xpack.esql.core.type.DataType;
+import org.elasticsearch.xpack.esql.expression.function.scalar.EsqlConfigurationFunction;
+import org.elasticsearch.xpack.esql.session.Configuration;
+
+import java.util.List;
+import java.util.Locale;
+
+import static org.elasticsearch.xpack.esql.core.expression.TypeResolutions.ParamOrdinal.DEFAULT;
+import static org.elasticsearch.xpack.esql.core.expression.TypeResolutions.isString;
+
+public abstract class ChangeCase extends EsqlConfigurationFunction {
+
+    public enum Case {
+        UPPER {
+            @Override
+            String process(String value, Locale locale) {
+                return value.toUpperCase(locale);
+            }
+
+            @Override
+            public boolean matchesCase(String value) {
+                return value.codePoints().allMatch(cp -> Character.getType(cp) != Character.LOWERCASE_LETTER);
+            }
+        },
+        LOWER {
+            @Override
+            String process(String value, Locale locale) {
+                return value.toLowerCase(locale);
+            }
+
+            @Override
+            public boolean matchesCase(String value) {
+                return value.codePoints().allMatch(cp -> Character.getType(cp) != Character.UPPERCASE_LETTER);
+            }
+        };
+
+        abstract String process(String value, Locale locale);
+
+        public abstract boolean matchesCase(String value);
+    }
+
+    private final Expression field;
+    private final Case caseType;
+
+    protected ChangeCase(Source source, Expression field, Configuration configuration, Case caseType) {
+        super(source, List.of(field), configuration);
+        this.field = field;
+        this.caseType = caseType;
+    }
+
+    @Override
+    public DataType dataType() {
+        return DataType.KEYWORD;
+    }
+
+    @Override
+    protected TypeResolution resolveType() {
+        if (childrenResolved() == false) {
+            return new TypeResolution("Unresolved children");
+        }
+
+        return isString(field, sourceText(), DEFAULT);
+    }
+
+    @Override
+    public boolean foldable() {
+        return field.foldable();
+    }
+
+    public Expression field() {
+        return field;
+    }
+
+    public Case caseType() {
+        return caseType;
+    }
+
+    public abstract Expression replaceChild(Expression child);
+
+    @Override
+    public Expression replaceChildren(List<Expression> newChildren) {
+        assert newChildren.size() == 1;
+        return replaceChild(newChildren.get(0));
+    }
+
+    @Evaluator
+    static BytesRef process(BytesRef val, @Fixed Locale locale, @Fixed Case caseType) {
+        return BytesRefs.toBytesRef(caseType.process(val.utf8ToString(), locale));
+    }
+
+    @Override
+    public EvalOperator.ExpressionEvaluator.Factory toEvaluator(ToEvaluator toEvaluator) {
+        var fieldEvaluator = toEvaluator.apply(field);
+        return new ChangeCaseEvaluator.Factory(source(), fieldEvaluator, configuration().locale(), caseType);
+    }
+}

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/string/ToLower.java

@@ -7,37 +7,23 @@
 
 package org.elasticsearch.xpack.esql.expression.function.scalar.string;
 
-import org.apache.lucene.util.BytesRef;
 import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
-import org.elasticsearch.common.lucene.BytesRefs;
-import org.elasticsearch.compute.ann.Evaluator;
-import org.elasticsearch.compute.ann.Fixed;
-import org.elasticsearch.compute.operator.EvalOperator.ExpressionEvaluator;
 import org.elasticsearch.xpack.esql.core.expression.Expression;
 import org.elasticsearch.xpack.esql.core.tree.NodeInfo;
 import org.elasticsearch.xpack.esql.core.tree.Source;
-import org.elasticsearch.xpack.esql.core.type.DataType;
 import org.elasticsearch.xpack.esql.expression.function.Example;
 import org.elasticsearch.xpack.esql.expression.function.FunctionInfo;
 import org.elasticsearch.xpack.esql.expression.function.Param;
-import org.elasticsearch.xpack.esql.expression.function.scalar.EsqlConfigurationFunction;
 import org.elasticsearch.xpack.esql.io.stream.PlanStreamInput;
 import org.elasticsearch.xpack.esql.session.Configuration;
 
 import java.io.IOException;
-import java.util.List;
-import java.util.Locale;
 
-import static org.elasticsearch.xpack.esql.core.expression.TypeResolutions.ParamOrdinal.DEFAULT;
-import static org.elasticsearch.xpack.esql.core.expression.TypeResolutions.isString;
-
-public class ToLower extends EsqlConfigurationFunction {
+public class ToLower extends ChangeCase {
     public static final NamedWriteableRegistry.Entry ENTRY = new NamedWriteableRegistry.Entry(Expression.class, "ToLower", ToLower::new);
 
-    private final Expression field;
-
     @FunctionInfo(
         returnType = { "keyword" },
         description = "Returns a new string representing the input string converted to lower case.",
@@ -52,8 +38,7 @@ public class ToLower extends EsqlConfigurationFunction {
         ) Expression field,
         Configuration configuration
     ) {
-        super(source, List.of(field), configuration);
-        this.field = field;
+        super(source, field, configuration, Case.LOWER);
     }
 
     private ToLower(StreamInput in) throws IOException {
@@ -70,52 +55,12 @@ public class ToLower extends EsqlConfigurationFunction {
         return ENTRY.name;
     }
 
-    @Override
-    public DataType dataType() {
-        return DataType.KEYWORD;
-    }
-
-    @Override
-    protected TypeResolution resolveType() {
-        if (childrenResolved() == false) {
-            return new TypeResolution("Unresolved children");
-        }
-
-        return isString(field, sourceText(), DEFAULT);
-    }
-
-    @Override
-    public boolean foldable() {
-        return field.foldable();
-    }
-
-    @Evaluator
-    static BytesRef process(BytesRef val, @Fixed Locale locale) {
-        return BytesRefs.toBytesRef(val.utf8ToString().toLowerCase(locale));
-    }
-
-    @Override
-    public ExpressionEvaluator.Factory toEvaluator(ToEvaluator toEvaluator) {
-        var fieldEvaluator = toEvaluator.apply(field);
-        return new ToLowerEvaluator.Factory(source(), fieldEvaluator, configuration().locale());
-    }
-
-    public Expression field() {
-        return field;
-    }
-
     public ToLower replaceChild(Expression child) {
         return new ToLower(source(), child, configuration());
     }
 
-    @Override
-    public Expression replaceChildren(List<Expression> newChildren) {
-        assert newChildren.size() == 1;
-        return replaceChild(newChildren.get(0));
-    }
-
     @Override
     protected NodeInfo<? extends Expression> info() {
-        return NodeInfo.create(this, ToLower::new, field, configuration());
+        return NodeInfo.create(this, ToLower::new, field(), configuration());
     }
 }

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/expression/function/scalar/string/ToUpper.java

@@ -7,37 +7,23 @@
 
 package org.elasticsearch.xpack.esql.expression.function.scalar.string;
 
-import org.apache.lucene.util.BytesRef;
 import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
-import org.elasticsearch.common.lucene.BytesRefs;
-import org.elasticsearch.compute.ann.Evaluator;
-import org.elasticsearch.compute.ann.Fixed;
-import org.elasticsearch.compute.operator.EvalOperator.ExpressionEvaluator;
 import org.elasticsearch.xpack.esql.core.expression.Expression;
 import org.elasticsearch.xpack.esql.core.tree.NodeInfo;
 import org.elasticsearch.xpack.esql.core.tree.Source;
-import org.elasticsearch.xpack.esql.core.type.DataType;
 import org.elasticsearch.xpack.esql.expression.function.Example;
 import org.elasticsearch.xpack.esql.expression.function.FunctionInfo;
 import org.elasticsearch.xpack.esql.expression.function.Param;
-import org.elasticsearch.xpack.esql.expression.function.scalar.EsqlConfigurationFunction;
 import org.elasticsearch.xpack.esql.io.stream.PlanStreamInput;
 import org.elasticsearch.xpack.esql.session.Configuration;
 
 import java.io.IOException;
-import java.util.List;
-import java.util.Locale;
 
-import static org.elasticsearch.xpack.esql.core.expression.TypeResolutions.ParamOrdinal.DEFAULT;
-import static org.elasticsearch.xpack.esql.core.expression.TypeResolutions.isString;
-
-public class ToUpper extends EsqlConfigurationFunction {
+public class ToUpper extends ChangeCase {
     public static final NamedWriteableRegistry.Entry ENTRY = new NamedWriteableRegistry.Entry(Expression.class, "ToUpper", ToUpper::new);
 
-    private final Expression field;
-
     @FunctionInfo(
         returnType = { "keyword" },
         description = "Returns a new string representing the input string converted to upper case.",
@@ -52,8 +38,7 @@ public class ToUpper extends EsqlConfigurationFunction {
         ) Expression field,
         Configuration configuration
     ) {
-        super(source, List.of(field), configuration);
-        this.field = field;
+        super(source, field, configuration, Case.UPPER);
     }
 
     private ToUpper(StreamInput in) throws IOException {
@@ -62,7 +47,7 @@ public class ToUpper extends EsqlConfigurationFunction {
 
     @Override
     public void writeTo(StreamOutput out) throws IOException {
-        out.writeNamedWriteable(field);
+        out.writeNamedWriteable(field());
     }
 
     @Override
@@ -70,52 +55,12 @@ public class ToUpper extends EsqlConfigurationFunction {
         return ENTRY.name;
     }
 
-    @Override
-    public DataType dataType() {
-        return DataType.KEYWORD;
-    }
-
-    @Override
-    protected TypeResolution resolveType() {
-        if (childrenResolved() == false) {
-            return new TypeResolution("Unresolved children");
-        }
-
-        return isString(field, sourceText(), DEFAULT);
-    }
-
-    @Override
-    public boolean foldable() {
-        return field.foldable();
-    }
-
-    @Evaluator
-    static BytesRef process(BytesRef val, @Fixed Locale locale) {
-        return BytesRefs.toBytesRef(val.utf8ToString().toUpperCase(locale));
-    }
-
-    @Override
-    public ExpressionEvaluator.Factory toEvaluator(ToEvaluator toEvaluator) {
-        var fieldEvaluator = toEvaluator.apply(field);
-        return new ToUpperEvaluator.Factory(source(), fieldEvaluator, configuration().locale());
-    }
-
-    public Expression field() {
-        return field;
-    }
-
     public ToUpper replaceChild(Expression child) {
         return new ToUpper(source(), child, configuration());
     }
 
-    @Override
-    public Expression replaceChildren(List<Expression> newChildren) {
-        assert newChildren.size() == 1;
-        return replaceChild(newChildren.get(0));
-    }
-
     @Override
     protected NodeInfo<? extends Expression> info() {
-        return NodeInfo.create(this, ToUpper::new, field, configuration());
+        return NodeInfo.create(this, ToUpper::new, field(), configuration());
     }
 }

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/optimizer/LogicalPlanOptimizer.java

@@ -49,6 +49,7 @@ import org.elasticsearch.xpack.esql.optimizer.rules.logical.ReplaceOrderByExpres
 import org.elasticsearch.xpack.esql.optimizer.rules.logical.ReplaceRegexMatch;
 import org.elasticsearch.xpack.esql.optimizer.rules.logical.ReplaceRowAsLocalRelation;
 import org.elasticsearch.xpack.esql.optimizer.rules.logical.ReplaceStatsFilteredAggWithEval;
+import org.elasticsearch.xpack.esql.optimizer.rules.logical.ReplaceStringCasingWithInsensitiveEquals;
 import org.elasticsearch.xpack.esql.optimizer.rules.logical.ReplaceTrivialTypeConversions;
 import org.elasticsearch.xpack.esql.optimizer.rules.logical.SetAsOptimized;
 import org.elasticsearch.xpack.esql.optimizer.rules.logical.SimplifyComparisonsArithmetics;
@@ -175,6 +176,7 @@ public class LogicalPlanOptimizer extends ParameterizedRuleExecutor<LogicalPlan,
             new CombineDisjunctions(),
             // TODO: bifunction can now (since we now have just one data types set) be pushed into the rule
             new SimplifyComparisonsArithmetics(DataType::areCompatible),
+            new ReplaceStringCasingWithInsensitiveEquals(),
             new ReplaceStatsFilteredAggWithEval(),
             new ExtractAggregateCommonFilter(),
             // prune/elimination

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/optimizer/rules/logical/ReplaceStringCasingWithInsensitiveEquals.java

@@ -0,0 +1,68 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+
+package org.elasticsearch.xpack.esql.optimizer.rules.logical;
+
+import org.elasticsearch.common.lucene.BytesRefs;
+import org.elasticsearch.xpack.esql.core.expression.Expression;
+import org.elasticsearch.xpack.esql.core.expression.Literal;
+import org.elasticsearch.xpack.esql.core.expression.function.scalar.ScalarFunction;
+import org.elasticsearch.xpack.esql.core.expression.predicate.logical.Not;
+import org.elasticsearch.xpack.esql.core.expression.predicate.nulls.IsNotNull;
+import org.elasticsearch.xpack.esql.core.expression.predicate.operator.comparison.BinaryComparison;
+import org.elasticsearch.xpack.esql.expression.function.scalar.string.ChangeCase;
+import org.elasticsearch.xpack.esql.expression.predicate.operator.comparison.Equals;
+import org.elasticsearch.xpack.esql.expression.predicate.operator.comparison.InsensitiveEquals;
+import org.elasticsearch.xpack.esql.expression.predicate.operator.comparison.NotEquals;
+
+public class ReplaceStringCasingWithInsensitiveEquals extends OptimizerRules.OptimizerExpressionRule<ScalarFunction> {
+
+    public ReplaceStringCasingWithInsensitiveEquals() {
+        super(OptimizerRules.TransformDirection.DOWN);
+    }
+
+    @Override
+    protected Expression rule(ScalarFunction sf) {
+        Expression e = sf;
+        if (sf instanceof BinaryComparison bc) {
+            e = rewriteBinaryComparison(sf, bc, false);
+        } else if (sf instanceof Not not && not.field() instanceof BinaryComparison bc) {
+            e = rewriteBinaryComparison(sf, bc, true);
+        }
+        return e;
+    }
+
+    private static Expression rewriteBinaryComparison(ScalarFunction sf, BinaryComparison bc, boolean negated) {
+        Expression e = sf;
+        if (bc.left() instanceof ChangeCase changeCase && bc.right().foldable()) {
+            if (bc instanceof Equals) {
+                e = replaceChangeCase(bc, changeCase, negated);
+            } else if (bc instanceof NotEquals) { // not actually used currently, `!=` is built as `NOT(==)` already
+                e = replaceChangeCase(bc, changeCase, negated == false);
+            }
+        }
+        return e;
+    }
+
+    private static Expression replaceChangeCase(BinaryComparison bc, ChangeCase changeCase, boolean negated) {
+        var foldedRight = BytesRefs.toString(bc.right().fold());
+        var field = unwrapCase(changeCase.field());
+        var e = changeCase.caseType().matchesCase(foldedRight)
+            ? new InsensitiveEquals(bc.source(), field, bc.right())
+            : Literal.of(bc, Boolean.FALSE);
+        if (negated) {
+            e = e instanceof Literal ? new IsNotNull(e.source(), field) : new Not(e.source(), e);
+        }
+        return e;
+    }
+
+    private static Expression unwrapCase(Expression e) {
+        for (; e instanceof ChangeCase cc; e = cc.field()) {
+        }
+        return e;
+    }
+}

x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/planner/LocalExecutionPlanner.java

@@ -575,6 +575,15 @@ public class LocalExecutionPlanner {
         if (localSourceExec.indexMode() != IndexMode.LOOKUP) {
             throw new IllegalArgumentException("can't plan [" + join + "]");
         }
+        Map<String, IndexMode> indicesWithModes = localSourceExec.index().indexNameWithModes();
+        if (indicesWithModes.size() != 1) {
+            throw new IllegalArgumentException("can't plan [" + join + "], found more than 1 index");
+        }
+        var entry = indicesWithModes.entrySet().iterator().next();
+        if (entry.getValue() != IndexMode.LOOKUP) {
+            throw new IllegalArgumentException("can't plan [" + join + "], found index with mode [" + entry.getValue() + "]");
+        }
+        String indexName = entry.getKey();
         List<Layout.ChannelAndType> matchFields = new ArrayList<>(join.leftFields().size());
         for (Attribute m : join.leftFields()) {
             Layout.ChannelAndType t = source.layout.get(m.id());
@@ -595,7 +604,7 @@ public class LocalExecutionPlanner {
                 matchFields.getFirst().channel(),
                 lookupFromIndexService,
                 matchFields.getFirst().type(),
-                localSourceExec.index().name(),
+                indexName,
                 join.leftFields().getFirst().name(),
                 join.addedFields().stream().map(f -> (NamedExpression) f).toList(),
                 join.source()

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/CsvTests.java

@@ -263,7 +263,7 @@ public class CsvTests extends ESTestCase {
             );
             assumeFalse(
                 "lookup join disabled for csv tests",
-                testCase.requiredCapabilities.contains(EsqlCapabilities.Cap.JOIN_LOOKUP_V8.capabilityName())
+                testCase.requiredCapabilities.contains(EsqlCapabilities.Cap.JOIN_LOOKUP_V9.capabilityName())
             );
             assumeFalse(
                 "can't use TERM function in csv tests",

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/AnalyzerTests.java

@@ -2140,7 +2140,7 @@ public class AnalyzerTests extends ESTestCase {
     }
 
     public void testLookupJoinUnknownIndex() {
-        assumeTrue("requires LOOKUP JOIN capability", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("requires LOOKUP JOIN capability", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         String errorMessage = "Unknown index [foobar]";
         IndexResolution missingLookupIndex = IndexResolution.invalid(errorMessage);
@@ -2169,7 +2169,7 @@ public class AnalyzerTests extends ESTestCase {
     }
 
     public void testLookupJoinUnknownField() {
-        assumeTrue("requires LOOKUP JOIN capability", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("requires LOOKUP JOIN capability", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         String query = "FROM test | LOOKUP JOIN languages_lookup ON last_name";
         String errorMessage = "1:45: Unknown column [last_name] in right side of join";
@@ -2192,7 +2192,7 @@ public class AnalyzerTests extends ESTestCase {
     }
 
     public void testMultipleLookupJoinsGiveDifferentAttributes() {
-        assumeTrue("requires LOOKUP JOIN capability", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("requires LOOKUP JOIN capability", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         // The field attributes that get contributed by different LOOKUP JOIN commands must have different name ids,
         // even if they have the same names. Otherwise, things like dependency analysis - like in PruneColumns - cannot work based on
@@ -2222,7 +2222,7 @@ public class AnalyzerTests extends ESTestCase {
     }
 
     public void testLookupJoinIndexMode() {
-        assumeTrue("requires LOOKUP JOIN capability", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("requires LOOKUP JOIN capability", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         var indexResolution = AnalyzerTestUtils.expandedDefaultIndexResolution();
         var lookupResolution = AnalyzerTestUtils.defaultLookupResolution();

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/ParsingTests.java

@@ -113,7 +113,7 @@ public class ParsingTests extends ESTestCase {
     }
 
     public void testJoinOnConstant() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertEquals(
             "1:55: JOIN ON clause only supports fields at the moment, found [123]",
             error("row languages = 1, gender = \"f\" | lookup join test on 123")
@@ -129,7 +129,7 @@ public class ParsingTests extends ESTestCase {
     }
 
     public void testJoinOnMultipleFields() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertEquals(
             "1:35: JOIN ON clause only supports one field at the moment, found [2]",
             error("row languages = 1, gender = \"f\" | lookup join test on gender, languages")
@@ -137,7 +137,7 @@ public class ParsingTests extends ESTestCase {
     }
 
     public void testJoinTwiceOnTheSameField() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertEquals(
             "1:35: JOIN ON clause only supports one field at the moment, found [2]",
             error("row languages = 1, gender = \"f\" | lookup join test on languages, languages")
@@ -145,7 +145,7 @@ public class ParsingTests extends ESTestCase {
     }
 
     public void testJoinTwiceOnTheSameField_TwoLookups() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertEquals(
             "1:80: JOIN ON clause only supports one field at the moment, found [2]",
             error("row languages = 1, gender = \"f\" | lookup join test on languages | eval x = 1 | lookup join test on gender, gender")

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/analysis/VerifierTests.java

@@ -1974,7 +1974,7 @@ public class VerifierTests extends ESTestCase {
     }
 
     public void testLookupJoinDataTypeMismatch() {
-        assumeTrue("requires LOOKUP JOIN capability", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("requires LOOKUP JOIN capability", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         query("FROM test | EVAL language_code = languages | LOOKUP JOIN languages_lookup ON language_code");
 

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/scalar/string/ToLowerTests.java

@@ -83,7 +83,7 @@ public class ToLowerTests extends AbstractConfigurationFunctionTestCase {
     private static TestCaseSupplier supplier(String name, DataType type, Supplier<String> valueSupplier) {
         return new TestCaseSupplier(name, List.of(type), () -> {
             List<TestCaseSupplier.TypedData> values = new ArrayList<>();
-            String expectedToString = "ToLowerEvaluator[val=Attribute[channel=0], locale=en_US]";
+            String expectedToString = "ChangeCaseEvaluator[val=Attribute[channel=0], locale=en_US, caseType=LOWER]";
 
             String value = valueSupplier.get();
             values.add(new TestCaseSupplier.TypedData(new BytesRef(value), type, "0"));

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/expression/function/scalar/string/ToUpperTests.java

@@ -83,7 +83,7 @@ public class ToUpperTests extends AbstractConfigurationFunctionTestCase {
     private static TestCaseSupplier supplier(String name, DataType type, Supplier<String> valueSupplier) {
         return new TestCaseSupplier(name, List.of(type), () -> {
             List<TestCaseSupplier.TypedData> values = new ArrayList<>();
-            String expectedToString = "ToUpperEvaluator[val=Attribute[channel=0], locale=en_US]";
+            String expectedToString = "ChangeCaseEvaluator[val=Attribute[channel=0], locale=en_US, caseType=UPPER]";
 
             String value = valueSupplier.get();
             values.add(new TestCaseSupplier.TypedData(new BytesRef(value), type, "0"));

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/optimizer/LogicalPlanOptimizerTests.java

@@ -39,6 +39,7 @@ import org.elasticsearch.xpack.esql.core.expression.Nullability;
 import org.elasticsearch.xpack.esql.core.expression.ReferenceAttribute;
 import org.elasticsearch.xpack.esql.core.expression.UnresolvedAttribute;
 import org.elasticsearch.xpack.esql.core.expression.predicate.logical.And;
+import org.elasticsearch.xpack.esql.core.expression.predicate.logical.Not;
 import org.elasticsearch.xpack.esql.core.expression.predicate.logical.Or;
 import org.elasticsearch.xpack.esql.core.expression.predicate.nulls.IsNotNull;
 import org.elasticsearch.xpack.esql.core.expression.predicate.operator.comparison.BinaryComparison;
@@ -85,6 +86,7 @@ import org.elasticsearch.xpack.esql.expression.predicate.operator.comparison.Equ
 import org.elasticsearch.xpack.esql.expression.predicate.operator.comparison.EsqlBinaryComparison;
 import org.elasticsearch.xpack.esql.expression.predicate.operator.comparison.GreaterThan;
 import org.elasticsearch.xpack.esql.expression.predicate.operator.comparison.In;
+import org.elasticsearch.xpack.esql.expression.predicate.operator.comparison.InsensitiveEquals;
 import org.elasticsearch.xpack.esql.expression.predicate.operator.comparison.LessThan;
 import org.elasticsearch.xpack.esql.index.EsIndex;
 import org.elasticsearch.xpack.esql.index.IndexResolution;
@@ -126,6 +128,7 @@ import org.junit.BeforeClass;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.function.BiFunction;
 import java.util.function.Function;
@@ -4924,7 +4927,7 @@ public class LogicalPlanOptimizerTests extends ESTestCase {
     }
 
     public void testPlanSanityCheckWithBinaryPlans() throws Exception {
-        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         var plan = optimizedPlan("""
               FROM test
@@ -5735,6 +5738,78 @@ public class LogicalPlanOptimizerTests extends ESTestCase {
         }
     }
 
+    public void testReplaceStringCasingWithInsensitiveEqualsUpperFalse() {
+        var plan = optimizedPlan("FROM test | WHERE TO_UPPER(first_name) == \"VALÜe\"");
+        var local = as(plan, LocalRelation.class);
+        assertThat(local.supplier(), equalTo(LocalSupplier.EMPTY));
+    }
+
+    public void testReplaceStringCasingWithInsensitiveEqualsUpperTrue() {
+        var plan = optimizedPlan("FROM test | WHERE TO_UPPER(first_name) != \"VALÜe\"");
+        var limit = as(plan, Limit.class);
+        var filter = as(limit.child(), Filter.class);
+        var isNotNull = as(filter.condition(), IsNotNull.class);
+        assertThat(Expressions.name(isNotNull.field()), is("first_name"));
+        as(filter.child(), EsRelation.class);
+    }
+
+    public void testReplaceStringCasingWithInsensitiveEqualsLowerFalse() {
+        var plan = optimizedPlan("FROM test | WHERE TO_LOWER(first_name) == \"VALÜe\"");
+        var local = as(plan, LocalRelation.class);
+        assertThat(local.supplier(), equalTo(LocalSupplier.EMPTY));
+    }
+
+    public void testReplaceStringCasingWithInsensitiveEqualsLowerTrue() {
+        var plan = optimizedPlan("FROM test | WHERE TO_LOWER(first_name) != \"VALÜe\"");
+        var limit = as(plan, Limit.class);
+        var filter = as(limit.child(), Filter.class);
+        assertThat(filter.condition(), instanceOf(IsNotNull.class));
+        as(filter.child(), EsRelation.class);
+    }
+
+    public void testReplaceStringCasingWithInsensitiveEqualsEquals() {
+        for (var fn : List.of("TO_LOWER", "TO_UPPER")) {
+            var value = fn.equals("TO_LOWER") ? fn.toLowerCase(Locale.ROOT) : fn.toUpperCase(Locale.ROOT);
+            value += "🐔✈🔥🎉"; // these should not cause folding, they're not in the upper/lower char class
+            var plan = optimizedPlan("FROM test | WHERE " + fn + "(first_name) == \"" + value + "\"");
+            var limit = as(plan, Limit.class);
+            var filter = as(limit.child(), Filter.class);
+            var insensitive = as(filter.condition(), InsensitiveEquals.class);
+            as(insensitive.left(), FieldAttribute.class);
+            var bRef = as(insensitive.right().fold(), BytesRef.class);
+            assertThat(bRef.utf8ToString(), is(value));
+            as(filter.child(), EsRelation.class);
+        }
+    }
+
+    public void testReplaceStringCasingWithInsensitiveEqualsNotEquals() {
+        for (var fn : List.of("TO_LOWER", "TO_UPPER")) {
+            var value = fn.equals("TO_LOWER") ? fn.toLowerCase(Locale.ROOT) : fn.toUpperCase(Locale.ROOT);
+            value += "🐔✈🔥🎉"; // these should not cause folding, they're not in the upper/lower char class
+            var plan = optimizedPlan("FROM test | WHERE " + fn + "(first_name) != \"" + value + "\"");
+            var limit = as(plan, Limit.class);
+            var filter = as(limit.child(), Filter.class);
+            var not = as(filter.condition(), Not.class);
+            var insensitive = as(not.field(), InsensitiveEquals.class);
+            as(insensitive.left(), FieldAttribute.class);
+            var bRef = as(insensitive.right().fold(), BytesRef.class);
+            assertThat(bRef.utf8ToString(), is(value));
+            as(filter.child(), EsRelation.class);
+        }
+    }
+
+    public void testReplaceStringCasingWithInsensitiveEqualsUnwrap() {
+        var plan = optimizedPlan("FROM test | WHERE TO_UPPER(TO_LOWER(TO_UPPER(first_name))) == \"VALÜ\"");
+        var limit = as(plan, Limit.class);
+        var filter = as(limit.child(), Filter.class);
+        var insensitive = as(filter.condition(), InsensitiveEquals.class);
+        var field = as(insensitive.left(), FieldAttribute.class);
+        assertThat(field.fieldName(), is("first_name"));
+        var bRef = as(insensitive.right().fold(), BytesRef.class);
+        assertThat(bRef.utf8ToString(), is("VALÜ"));
+        as(filter.child(), EsRelation.class);
+    }
+
     @Override
     protected List<String> filteredWarnings() {
         return withDefaultLimitWarning(super.filteredWarnings());
@@ -5928,7 +6003,7 @@ public class LogicalPlanOptimizerTests extends ESTestCase {
      *     \_EsRelation[languages_lookup][LOOKUP][language_code{f}#18, language_name{f}#19]
      */
     public void testLookupJoinPushDownFilterOnJoinKeyWithRename() {
-        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         String query = """
               FROM test
@@ -5970,7 +6045,7 @@ public class LogicalPlanOptimizerTests extends ESTestCase {
      *     \_EsRelation[languages_lookup][LOOKUP][language_code{f}#18, language_name{f}#19]
      */
     public void testLookupJoinPushDownFilterOnLeftSideField() {
-        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         String query = """
               FROM test
@@ -6013,7 +6088,7 @@ public class LogicalPlanOptimizerTests extends ESTestCase {
      *       \_EsRelation[languages_lookup][LOOKUP][language_code{f}#18, language_name{f}#19]
      */
     public void testLookupJoinPushDownDisabledForLookupField() {
-        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         String query = """
               FROM test
@@ -6057,7 +6132,7 @@ public class LogicalPlanOptimizerTests extends ESTestCase {
      *       \_EsRelation[languages_lookup][LOOKUP][language_code{f}#19, language_name{f}#20]
      */
     public void testLookupJoinPushDownSeparatedForConjunctionBetweenLeftAndRightField() {
-        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         String query = """
               FROM test
@@ -6108,7 +6183,7 @@ public class LogicalPlanOptimizerTests extends ESTestCase {
      *       \_EsRelation[languages_lookup][LOOKUP][language_code{f}#19, language_name{f}#20]
      */
     public void testLookupJoinPushDownDisabledForDisjunctionBetweenLeftAndRightField() {
-        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         String query = """
               FROM test

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/optimizer/PhysicalPlanOptimizerTests.java

@@ -174,6 +174,7 @@ import static org.elasticsearch.xpack.esql.core.type.DataType.CARTESIAN_POINT;
 import static org.elasticsearch.xpack.esql.core.type.DataType.CARTESIAN_SHAPE;
 import static org.elasticsearch.xpack.esql.core.type.DataType.GEO_POINT;
 import static org.elasticsearch.xpack.esql.core.type.DataType.GEO_SHAPE;
+import static org.elasticsearch.xpack.esql.core.util.TestUtils.stripThrough;
 import static org.elasticsearch.xpack.esql.parser.ExpressionBuilder.MAX_EXPRESSION_DEPTH;
 import static org.elasticsearch.xpack.esql.parser.LogicalPlanBuilder.MAX_QUERY_DEPTH;
 import static org.hamcrest.Matchers.closeTo;
@@ -1803,7 +1804,7 @@ public class PhysicalPlanOptimizerTests extends ESTestCase {
         assertThat(source.estimatedRowSize(), equalTo(allFieldRowSize + Integer.BYTES));
 
         QueryBuilder query = source.query();
-        assertNotNull(query);
+        assertNotNull(query); // TODO: verify query
     }
 
     /**
@@ -1838,7 +1839,257 @@ public class PhysicalPlanOptimizerTests extends ESTestCase {
         var source = source(extract.child());
 
         QueryBuilder query = source.query();
-        assertNull(query);
+        assertNull(query); // TODO: verify query
+    }
+
+    public void testPushDownEqualsToUpper() {
+        doTestPushDownChangeCase("""
+            from test
+            | where to_upper(first_name) == "FOO"
+            """, """
+            {
+              "esql_single_value" : {
+                "field" : "first_name",
+                "next" : {
+                  "term" : {
+                    "first_name" : {
+                      "value" : "FOO",
+                      "case_insensitive" : true
+                    }
+                  }
+                },
+                "source" : "to_upper(first_name) == \\"FOO\\"@2:9"
+              }
+            }""");
+    }
+
+    /*
+     * LimitExec[1000[INTEGER]]
+     * \_ExchangeExec[[_meta_field{f}#9, emp_no{f}#3, first_name{f}#4, gender{f}#5, hire_date{f}#10, job{f}#11, job.raw{f}#12,
+     *                languages{f}#6, last_name{f}#7, long_noidx{f}#13, salary{f}#8],false]
+     *   \_ProjectExec[[_meta_field{f}#9, emp_no{f}#3, first_name{f}#4, gender{f}#5, hire_date{f}#10, job{f}#11, job.raw{f}#12,
+     *                  languages{f}#6, last_name{f}#7, long_noidx{f}#13, salary{f}#8]]
+     *     \_FieldExtractExec[_meta_field{f}#9, emp_no{f}#3, first_name{f}#4, gen..]<[]>
+     *       \_EsQueryExec[test], indexMode[standard], query[{...}}][_doc{f}#25], limit[1000], sort[] estimatedRowSize[332]
+     */
+    private void doTestPushDownChangeCase(String esql, String expected) {
+        var plan = physicalPlan(esql);
+        var optimized = optimizedPlan(plan);
+        var topLimit = as(optimized, LimitExec.class);
+        var exchange = asRemoteExchange(topLimit.child());
+        var project = as(exchange.child(), ProjectExec.class);
+        var extractRest = as(project.child(), FieldExtractExec.class);
+        var source = source(extractRest.child());
+        assertThat(source.estimatedRowSize(), equalTo(allFieldRowSize + Integer.BYTES));
+
+        QueryBuilder query = source.query();
+        assertThat(stripThrough(query.toString()), is(stripThrough(expected)));
+    }
+
+    public void testPushDownEqualsToLower() {
+        doTestPushDownChangeCase("""
+            from test
+            | where to_lower(first_name) == "foo"
+            """, """
+            {
+              "esql_single_value" : {
+                "field" : "first_name",
+                "next" : {
+                  "term" : {
+                    "first_name" : {
+                      "value" : "foo",
+                      "case_insensitive" : true
+                    }
+                  }
+                },
+                "source" : "to_lower(first_name) == \\"foo\\"@2:9"
+              }
+            }""");
+    }
+
+    public void testPushDownNotEqualsToUpper() {
+        doTestPushDownChangeCase("""
+            from test
+            | where to_upper(first_name) != "FOO"
+            """, """
+            {
+              "esql_single_value" : {
+                "field" : "first_name",
+                "next" : {
+                  "bool" : {
+                    "must_not" : [
+                      {
+                        "term" : {
+                          "first_name" : {
+                            "value" : "FOO",
+                            "case_insensitive" : true
+                          }
+                        }
+                      }
+                    ],
+                    "boost" : 1.0
+                  }
+                },
+                "source" : "to_upper(first_name) != \\"FOO\\"@2:9"
+              }
+            }""");
+    }
+
+    public void testPushDownNotEqualsToLower() {
+        doTestPushDownChangeCase("""
+            from test
+            | where to_lower(first_name) != "foo"
+            """, """
+            {
+              "esql_single_value" : {
+                "field" : "first_name",
+                "next" : {
+                  "bool" : {
+                    "must_not" : [
+                      {
+                        "term" : {
+                          "first_name" : {
+                            "value" : "foo",
+                            "case_insensitive" : true
+                          }
+                        }
+                      }
+                    ],
+                    "boost" : 1.0
+                  }
+                },
+                "source" : "to_lower(first_name) != \\"foo\\"@2:9"
+              }
+            }""");
+    }
+
+    public void testPushDownChangeCaseMultiplePredicates() {
+        doTestPushDownChangeCase("""
+            from test
+            | where to_lower(first_name) != "foo" or to_upper(first_name) == "FOO" or emp_no > 10
+            """, """
+            {
+              "bool" : {
+                "should" : [
+                  {
+                    "esql_single_value" : {
+                      "field" : "first_name",
+                      "next" : {
+                        "bool" : {
+                          "must_not" : [
+                            {
+                              "term" : {
+                                "first_name" : {
+                                  "value" : "foo",
+                                  "case_insensitive" : true
+                                }
+                              }
+                            }
+                          ],
+                          "boost" : 1.0
+                        }
+                      },
+                      "source" : "to_lower(first_name) != \\"foo\\"@2:9"
+                    }
+                  },
+                  {
+                    "esql_single_value" : {
+                      "field" : "first_name",
+                      "next" : {
+                        "term" : {
+                          "first_name" : {
+                            "value" : "FOO",
+                            "case_insensitive" : true
+                          }
+                        }
+                      },
+                      "source" : "to_upper(first_name) == \\"FOO\\"@2:42"
+                    }
+                  },
+                  {
+                    "esql_single_value" : {
+                      "field" : "emp_no",
+                      "next" : {
+                        "range" : {
+                          "emp_no" : {
+                            "gt" : 10,
+                            "boost" : 1.0
+                          }
+                        }
+                      },
+                      "source" : "emp_no > 10@2:75"
+                    }
+                  }
+                ],
+                "boost" : 1.0
+              }
+            }
+            """);
+    }
+
+    // same tree as with doTestPushDownChangeCase(), but with a topping EvalExec (for `x`)
+    public void testPushDownChangeCaseThroughEval() {
+        var esql = """
+            from test
+            | eval x = first_name
+            | where to_lower(x) == "foo"
+            """;
+        var plan = physicalPlan(esql);
+        var optimized = optimizedPlan(plan);
+        var eval = as(optimized, EvalExec.class);
+        var topLimit = as(eval.child(), LimitExec.class);
+        var exchange = asRemoteExchange(topLimit.child());
+        var project = as(exchange.child(), ProjectExec.class);
+        var extractRest = as(project.child(), FieldExtractExec.class);
+        var source = source(extractRest.child());
+
+        var expected = """
+            {
+              "esql_single_value" : {
+                "field" : "first_name",
+                "next" : {
+                  "term" : {
+                    "first_name" : {
+                      "value" : "foo",
+                      "case_insensitive" : true
+                    }
+                  }
+                },
+                "source" : "to_lower(x) == \\"foo\\"@3:9"
+              }
+            }""";
+        QueryBuilder query = source.query();
+        assertThat(stripThrough(query.toString()), is(stripThrough(expected)));
+    }
+
+    /*
+     * LimitExec[1000[INTEGER]]
+     * \_ExchangeExec[[_meta_field{f}#9, emp_no{f}#3, first_name{f}#4, gender{f}#5, hire_date{f}#10, job{f}#11, job.raw{f}#12,
+     *                languages{f}#6, last_name{f}#7, long_noidx{f}#13, salary{f}#8],false]
+     *   \_ProjectExec[[_meta_field{f}#9, emp_no{f}#3, first_name{f}#4, gender{f}#5, hire_date{f}#10, job{f}#11, job.raw{f}#12,
+     *                 languages{f}#6, last_name{f}#7, long_noidx{f}#13, salary{f}#8]]
+     *     \_FieldExtractExec[_meta_field{f}#9, emp_no{f}#3, gender{f}#5, hire_da..]<[]>
+     *       \_LimitExec[1000[INTEGER]]
+     *         \_FilterExec[NOT(INSENSITIVEEQUALS(CONCAT(first_name{f}#4,[66 6f 6f][KEYWORD]),[66 6f 6f][KEYWORD]))]
+     *           \_FieldExtractExec[first_name{f}#4]<[]>
+     *             \_EsQueryExec[test], indexMode[standard], query[][_doc{f}#25], limit[], sort[] estimatedRowSize[332]
+     */
+    public void testNoPushDownChangeCase() {
+        var plan = physicalPlan("""
+            from test
+            | where to_lower(concat(first_name, "foo")) != "foo"
+            """);
+
+        var optimized = optimizedPlan(plan);
+        var topLimit = as(optimized, LimitExec.class);
+        var exchange = asRemoteExchange(topLimit.child());
+        var project = as(exchange.child(), ProjectExec.class);
+        var fieldExtract = as(project.child(), FieldExtractExec.class);
+        var limit = as(fieldExtract.child(), LimitExec.class);
+        var filter = as(limit.child(), FilterExec.class);
+        var fieldExtract2 = as(filter.child(), FieldExtractExec.class);
+        var source = source(fieldExtract2.child());
+        assertThat(source.query(), nullValue());
     }
 
     public void testPushDownNotRLike() {
@@ -2364,7 +2615,7 @@ public class PhysicalPlanOptimizerTests extends ESTestCase {
     }
 
     public void testVerifierOnMissingReferencesWithBinaryPlans() throws Exception {
-        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         // Do not assert serialization:
         // This will have a LookupJoinExec, which is not serializable because it doesn't leave the coordinator.
@@ -7047,7 +7298,7 @@ public class PhysicalPlanOptimizerTests extends ESTestCase {
     }
 
     public void testLookupJoinFieldLoading() throws Exception {
-        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         TestDataSource data = dataSetWithLookupIndices(Map.of("lookup_index", List.of("first_name", "foo", "bar", "baz")));
 
@@ -7124,7 +7375,7 @@ public class PhysicalPlanOptimizerTests extends ESTestCase {
     }
 
     public void testLookupJoinFieldLoadingTwoLookups() throws Exception {
-        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         TestDataSource data = dataSetWithLookupIndices(
             Map.of(
@@ -7178,7 +7429,7 @@ public class PhysicalPlanOptimizerTests extends ESTestCase {
 
     @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/119082")
     public void testLookupJoinFieldLoadingTwoLookupsProjectInBetween() throws Exception {
-        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         TestDataSource data = dataSetWithLookupIndices(
             Map.of(
@@ -7219,7 +7470,7 @@ public class PhysicalPlanOptimizerTests extends ESTestCase {
 
     @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/118778")
     public void testLookupJoinFieldLoadingDropAllFields() throws Exception {
-        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("Requires LOOKUP JOIN", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
 
         TestDataSource data = dataSetWithLookupIndices(Map.of("lookup_index", List.of("first_name", "foo", "bar", "baz")));
 

x-pack/plugin/esql/src/test/java/org/elasticsearch/xpack/esql/session/IndexResolverFieldNamesTests.java

@@ -1365,7 +1365,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testLookupJoin() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             "FROM employees | KEEP languages | RENAME languages AS language_code | LOOKUP JOIN languages_lookup ON language_code",
             Set.of("languages", "languages.*", "language_code", "language_code.*"),
@@ -1374,7 +1374,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testLookupJoinKeep() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             """
                 FROM employees
@@ -1388,7 +1388,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testLookupJoinKeepWildcard() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             """
                 FROM employees
@@ -1402,7 +1402,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testMultiLookupJoin() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             """
                 FROM sample_data
@@ -1415,7 +1415,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testMultiLookupJoinKeepBefore() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             """
                 FROM sample_data
@@ -1429,7 +1429,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testMultiLookupJoinKeepBetween() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             """
                 FROM sample_data
@@ -1454,7 +1454,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testMultiLookupJoinKeepAfter() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             """
                 FROM sample_data
@@ -1481,7 +1481,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testMultiLookupJoinKeepAfterWildcard() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             """
                 FROM sample_data
@@ -1495,7 +1495,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testMultiLookupJoinSameIndex() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             """
                 FROM sample_data
@@ -1509,7 +1509,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testMultiLookupJoinSameIndexKeepBefore() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             """
                 FROM sample_data
@@ -1524,7 +1524,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testMultiLookupJoinSameIndexKeepBetween() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             """
                 FROM sample_data
@@ -1550,7 +1550,7 @@ public class IndexResolverFieldNamesTests extends ESTestCase {
     }
 
     public void testMultiLookupJoinSameIndexKeepAfter() {
-        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V8.isEnabled());
+        assumeTrue("LOOKUP JOIN available as snapshot only", EsqlCapabilities.Cap.JOIN_LOOKUP_V9.isEnabled());
         assertFieldNames(
             """
                 FROM sample_data