Add ability to redirect ingestion failures on data streams to a failure store (#126973)

Removes the feature flags and guards that prevent the new failure store functionality 
from operating in production runtimes.

docs/build.gradle

@@ -85,9 +85,6 @@ testClusters.matching { it.name == "yamlRestTest"}.configureEach {
     setting 'xpack.license.self_generated.type', 'trial'
     setting 'indices.lifecycle.history_index_enabled', 'false'
     keystorePassword 'keystore-password'
-    if (buildParams.snapshotBuild == false) {
-      requiresFeature 'es.failure_store_feature_flag_enabled', new Version(8, 12, 0)
-    }
   }
 
   // debug ccr test failures:
@@ -126,7 +123,6 @@ testClusters.matching { it.name == "yamlRestTest"}.configureEach {
 
 
   requiresFeature 'es.index_mode_feature_flag_registered', Version.fromString("8.0.0")
-  requiresFeature 'es.failure_store_feature_flag_enabled', Version.fromString("8.12.0")
 
   // TODO Rene: clean up this kind of cross project file references
   extraConfigFile 'op-jwks.json', project(':x-pack:test:idp-fixture').file("src/main/resources/oidc/op-jwks.json")

docs/changelog/126973.yaml

@@ -0,0 +1,89 @@
+pr: 126973
+summary: Add ability to redirect ingestion failures on data streams to a failure store
+area: Data streams
+type: feature
+issues: []
+highlight:
+  title: Add ability to redirect ingestion failures on data streams to a failure store
+  body: |-
+    Documents that encountered ingest pipeline failures or mapping conflicts
+    would previously be returned to the client as errors in the bulk and
+    index operations. Many client applications are not equipped to respond
+    to these failures. This leads to the failed documents often being
+    dropped by the client which cannot hold the broken documents
+    indefinitely. In many end user workloads, these failed documents
+    represent events that could be critical signals for observability or
+    security use cases.
+
+    To help mitigate this problem, data streams can now maintain a "failure
+    store" which is used to accept and hold documents that fail to be
+    ingested due to preventable configuration errors. The data stream's
+    failure store operates like a separate set of backing indices with their
+    own mappings and access patterns that allow Elasticsearch to accept
+    documents that would otherwise be rejected due to unhandled ingest
+    pipeline exceptions or mapping conflicts.
+
+    Users can enable redirection of ingest failures to the failure store on
+    new data streams by specifying it in the new `data_stream_options` field
+    inside of a component or index template:
+
+    [source,yaml]
+    ----
+    PUT _index_template/my-template
+    {
+      "index_patterns": ["logs-test-*"],
+      "data_stream": {},
+      "template": {
+        "data_stream_options": {
+          "failure_store": {
+            "enabled": true
+          }
+        }
+      }
+    }'
+    ----
+
+    Existing data streams can be configured with the new data stream
+    `_options` endpoint:
+
+    [source,yaml]
+    ----
+    PUT _data_stream/logs-test-apache/_options
+    {
+      "failure_store": {
+        "enabled": "true"
+      }
+    }
+    ----
+
+    When redirection is enabled, any ingestion related failures will be
+    captured in the failure store if the cluster is able to, along with the
+    timestamp that the failure occurred, details about the error
+    encountered, and the document that could not be ingested. Since failure
+    stores are a kind of Elasticsearch index, we can search the data stream
+    for the failures that it has collected. The failures are not shown by
+    default as they are stored in different indices than the normal data
+    stream data. In order to retrieve the failures, we use the `_search` API
+    along with a new bit of index pattern syntax, the `::` selector.
+
+    [source,yaml]
+    ----
+    POST logs-test-apache::failures/_search
+    ----
+
+    This index syntax informs the search operation to target the indices in
+    its failure store instead of its backing indices. It can be mixed in a
+    number of ways with other index patterns to include their failure store
+    indices in the search operation:
+
+    [source,yaml]
+    ----
+    POST logs-*::failures/_search
+    POST logs-*,logs-*::failures/_search
+    POST *::failures/_search
+    POST _query
+    {
+      "query": "FROM my_data_stream*::failures"
+    }
+    ----
+  notable: true

modules/data-streams/build.gradle

@@ -36,12 +36,6 @@ if (buildParams.inFipsJvm){
   tasks.named("yamlRestTest").configure{enabled = false }
 }
 
-if (buildParams.snapshotBuild == false) {
-  tasks.withType(Test).configureEach {
-    systemProperty 'es.failure_store_feature_flag_enabled', 'true'
-  }
-}
-
 tasks.named("yamlRestCompatTestTransform").configure({ task ->
   task.skipTest("data_stream/10_basic/Create hidden data stream", "warning does not exist for compatibility")
 

modules/data-streams/src/javaRestTest/java/org/elasticsearch/datastreams/AbstractDataStreamIT.java

@@ -16,7 +16,6 @@ import org.elasticsearch.common.settings.SecureString;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.ThreadContext;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.junit.After;
@@ -38,7 +37,6 @@ public abstract class AbstractDataStreamIT extends ESRestTestCase {
     @ClassRule
     public static ElasticsearchCluster cluster = ElasticsearchCluster.local()
         .distribution(DistributionType.DEFAULT)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .setting("xpack.security.enabled", "false")
         .setting("xpack.watcher.enabled", "false")
         // Disable apm-data so the index templates it installs do not impact

modules/data-streams/src/javaRestTest/java/org/elasticsearch/datastreams/DataStreamWithSecurityIT.java

@@ -15,7 +15,6 @@ import org.elasticsearch.common.settings.SecureString;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.ThreadContext;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.cluster.util.resource.Resource;
 import org.elasticsearch.test.rest.ESRestTestCase;
@@ -29,7 +28,6 @@ public class DataStreamWithSecurityIT extends ESRestTestCase {
     @ClassRule
     public static ElasticsearchCluster cluster = ElasticsearchCluster.local()
         .distribution(DistributionType.DEFAULT)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .setting("xpack.watcher.enabled", "false")
         .setting("xpack.ml.enabled", "false")
         .setting("xpack.security.enabled", "true")

modules/data-streams/src/javaRestTest/java/org/elasticsearch/datastreams/DisabledSecurityDataStreamTestCase.java

@@ -13,7 +13,6 @@ import org.elasticsearch.common.settings.SecureString;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.ThreadContext;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.junit.ClassRule;
@@ -27,7 +26,6 @@ public abstract class DisabledSecurityDataStreamTestCase extends ESRestTestCase
     @ClassRule
     public static ElasticsearchCluster cluster = ElasticsearchCluster.local()
         .distribution(DistributionType.DEFAULT)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .setting("xpack.security.enabled", "false")
         .setting("xpack.watcher.enabled", "false")
         .build();

modules/data-streams/src/javaRestTest/java/org/elasticsearch/datastreams/LazyRolloverDataStreamIT.java

@@ -17,7 +17,6 @@ import org.elasticsearch.common.settings.SecureString;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.ThreadContext;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.cluster.util.resource.Resource;
 import org.elasticsearch.test.rest.ESRestTestCase;
@@ -41,7 +40,6 @@ public class LazyRolloverDataStreamIT extends ESRestTestCase {
     @ClassRule
     public static ElasticsearchCluster cluster = ElasticsearchCluster.local()
         .distribution(DistributionType.DEFAULT)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .setting("xpack.watcher.enabled", "false")
         .setting("xpack.ml.enabled", "false")
         .setting("xpack.security.enabled", "true")

modules/data-streams/src/javaRestTest/java/org/elasticsearch/datastreams/lifecycle/DataStreamLifecyclePermissionsTestCase.java

@@ -19,7 +19,6 @@ import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.ThreadContext;
 import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.cluster.util.resource.Resource;
 import org.elasticsearch.test.rest.ESRestTestCase;
@@ -46,7 +45,6 @@ public abstract class DataStreamLifecyclePermissionsTestCase extends ESRestTestC
     @ClassRule
     public static ElasticsearchCluster cluster = ElasticsearchCluster.local()
         .distribution(DistributionType.DEFAULT)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .setting("xpack.watcher.enabled", "false")
         .setting("xpack.ml.enabled", "false")
         .setting("xpack.security.enabled", "true")

modules/data-streams/src/main/java/org/elasticsearch/datastreams/DataStreamFeatures.java

@@ -28,7 +28,7 @@ public class DataStreamFeatures implements FeatureSpecification {
 
     @Override
     public Set<NodeFeature> getFeatures() {
-        return DataStream.isFailureStoreFeatureFlagEnabled() ? Set.of(DataStream.DATA_STREAM_FAILURE_STORE_FEATURE) : Set.of();
+        return Set.of(DataStream.DATA_STREAM_FAILURE_STORE_FEATURE);
     }
 
     @Override

modules/data-streams/src/main/java/org/elasticsearch/datastreams/DataStreamsPlugin.java

@@ -21,7 +21,6 @@ import org.elasticsearch.action.datastreams.lifecycle.ExplainDataStreamLifecycle
 import org.elasticsearch.action.datastreams.lifecycle.GetDataStreamLifecycleAction;
 import org.elasticsearch.action.datastreams.lifecycle.PutDataStreamLifecycleAction;
 import org.elasticsearch.client.internal.OriginSettingClient;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
 import org.elasticsearch.cluster.node.DiscoveryNodes;
 import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
@@ -237,11 +236,9 @@ public class DataStreamsPlugin extends Plugin implements ActionPlugin, HealthPlu
         actions.add(new ActionHandler(DeleteDataStreamLifecycleAction.INSTANCE, TransportDeleteDataStreamLifecycleAction.class));
         actions.add(new ActionHandler(ExplainDataStreamLifecycleAction.INSTANCE, TransportExplainDataStreamLifecycleAction.class));
         actions.add(new ActionHandler(GetDataStreamLifecycleStatsAction.INSTANCE, TransportGetDataStreamLifecycleStatsAction.class));
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         actions.add(new ActionHandler(GetDataStreamOptionsAction.INSTANCE, TransportGetDataStreamOptionsAction.class));
         actions.add(new ActionHandler(PutDataStreamOptionsAction.INSTANCE, TransportPutDataStreamOptionsAction.class));
         actions.add(new ActionHandler(DeleteDataStreamOptionsAction.INSTANCE, TransportDeleteDataStreamOptionsAction.class));
-        }
         return actions;
     }
 
@@ -274,11 +271,9 @@ public class DataStreamsPlugin extends Plugin implements ActionPlugin, HealthPlu
         handlers.add(new RestDeleteDataStreamLifecycleAction());
         handlers.add(new RestExplainDataStreamLifecycleAction());
         handlers.add(new RestDataStreamLifecycleStatsAction());
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         handlers.add(new RestGetDataStreamOptionsAction());
         handlers.add(new RestPutDataStreamOptionsAction());
         handlers.add(new RestDeleteDataStreamOptionsAction());
-        }
         return handlers;
     }
 

modules/data-streams/src/main/java/org/elasticsearch/datastreams/action/TransportGetDataStreamsAction.java

@@ -230,8 +230,7 @@ public class TransportGetDataStreamsAction extends TransportLocalProjectMetadata
         for (DataStream dataStream : dataStreams) {
             // For this action, we are returning whether the failure store is effectively enabled, either in metadata or by cluster setting.
             // Users can use the get data stream options API to find out whether it is explicitly enabled in metadata.
-            boolean failureStoreEffectivelyEnabled = DataStream.isFailureStoreFeatureFlagEnabled()
+            boolean failureStoreEffectivelyEnabled = dataStream.isFailureStoreEffectivelyEnabled(dataStreamFailureStoreSettings);
-                && dataStream.isFailureStoreEffectivelyEnabled(dataStreamFailureStoreSettings);
             final String indexTemplate;
             boolean indexTemplatePreferIlmValue = true;
             String ilmPolicyName = null;
@@ -289,7 +288,7 @@ public class TransportGetDataStreamsAction extends TransportLocalProjectMetadata
             Map<Index, IndexProperties> backingIndicesSettingsValues = new HashMap<>();
             ProjectMetadata metadata = state.metadata();
             collectIndexSettingsValues(dataStream, backingIndicesSettingsValues, metadata, dataStream.getIndices());
-            if (DataStream.isFailureStoreFeatureFlagEnabled() && dataStream.getFailureIndices().isEmpty() == false) {
+            if (dataStream.getFailureIndices().isEmpty() == false) {
                 collectIndexSettingsValues(dataStream, backingIndicesSettingsValues, metadata, dataStream.getFailureIndices());
             }
 

modules/data-streams/src/main/java/org/elasticsearch/datastreams/lifecycle/DataStreamLifecycleService.java

@@ -375,12 +375,10 @@ public class DataStreamLifecycleService implements ClusterStateListener, Closeab
             // These are the pre-rollover write indices. They may or may not be the write index after maybeExecuteRollover has executed,
             // depending on rollover criteria, for this reason we exclude them for the remaining run.
             indicesToExcludeForRemainingRun.add(maybeExecuteRollover(project, dataStream, false));
-            if (DataStream.isFailureStoreFeatureFlagEnabled()) {
             Index failureStoreWriteIndex = maybeExecuteRollover(project, dataStream, true);
             if (failureStoreWriteIndex != null) {
                 indicesToExcludeForRemainingRun.add(failureStoreWriteIndex);
             }
-            }
 
             // tsds indices that are still within their time bounds (i.e. now < time_series.end_time) - we don't want these indices to be
             // deleted, forcemerged, or downsampled as they're still expected to receive large amounts of writes
@@ -802,7 +800,7 @@ public class DataStreamLifecycleService implements ClusterStateListener, Closeab
                 targetIndices.add(index);
             }
         }
-        if (withFailureStore && DataStream.isFailureStoreFeatureFlagEnabled() && dataStream.getFailureIndices().isEmpty() == false) {
+        if (withFailureStore && dataStream.getFailureIndices().isEmpty() == false) {
             for (Index index : dataStream.getFailureIndices()) {
                 if (dataStream.isIndexManagedByDataStreamLifecycle(index, indexMetadataSupplier)
                     && indicesToExcludeForRemainingRun.contains(index) == false) {

modules/data-streams/src/test/java/org/elasticsearch/datastreams/action/DeleteDataStreamTransportActionTests.java

@@ -27,7 +27,6 @@ import org.elasticsearch.snapshots.Snapshot;
 import org.elasticsearch.snapshots.SnapshotId;
 import org.elasticsearch.snapshots.SnapshotInProgressException;
 import org.elasticsearch.test.ESTestCase;
-import org.junit.Assume;
 
 import java.util.Collections;
 import java.util.List;
@@ -69,8 +68,6 @@ public class DeleteDataStreamTransportActionTests extends ESTestCase {
     }
 
     public void testDeleteDataStreamWithFailureStore() {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         final String dataStreamName = "my-data-stream";
         final List<String> otherIndices = randomSubsetOf(List.of("foo", "bar", "baz"));
 

modules/data-streams/src/test/java/org/elasticsearch/datastreams/action/GetDataStreamsResponseTests.java

@@ -134,23 +134,18 @@ public class GetDataStreamsResponseTests extends ESTestCase {
                     is(ManagedBy.LIFECYCLE.displayValue)
                 );
 
-                if (DataStream.isFailureStoreFeatureFlagEnabled()) {
                 var failureStore = (Map<String, Object>) dataStreamMap.get(DataStream.FAILURE_STORE_FIELD.getPreferredName());
                 List<Object> failureStoresRepresentation = (List<Object>) failureStore.get(DataStream.INDICES_FIELD.getPreferredName());
                 Map<String, Object> failureStoreRepresentation = (Map<String, Object>) failureStoresRepresentation.get(0);
                 assertThat(failureStoreRepresentation.get("index_name"), is(failureStoreIndex.getName()));
                 assertThat(failureStoreRepresentation.get(Response.DataStreamInfo.PREFER_ILM.getPreferredName()), is(false));
-                    assertThat(
+                assertThat(failureStoreRepresentation.get(Response.DataStreamInfo.ILM_POLICY_FIELD.getPreferredName()), is(nullValue()));
-                        failureStoreRepresentation.get(Response.DataStreamInfo.ILM_POLICY_FIELD.getPreferredName()),
-                        is(nullValue())
-                    );
                 assertThat(
                     failureStoreRepresentation.get(Response.DataStreamInfo.MANAGED_BY.getPreferredName()),
                     is(ManagedBy.LIFECYCLE.displayValue)
                 );
             }
         }
-        }
 
         {
             // data stream has a lifecycle that's not enabled
@@ -228,16 +223,12 @@ public class GetDataStreamsResponseTests extends ESTestCase {
                     is(ManagedBy.UNMANAGED.displayValue)
                 );
 
-                if (DataStream.isFailureStoreFeatureFlagEnabled()) {
                 var failureStore = (Map<String, Object>) dataStreamMap.get(DataStream.FAILURE_STORE_FIELD.getPreferredName());
                 List<Object> failureStoresRepresentation = (List<Object>) failureStore.get(DataStream.INDICES_FIELD.getPreferredName());
                 Map<String, Object> failureStoreRepresentation = (Map<String, Object>) failureStoresRepresentation.get(0);
                 assertThat(failureStoreRepresentation.get("index_name"), is(failureStoreIndex.getName()));
                 assertThat(failureStoreRepresentation.get(Response.DataStreamInfo.PREFER_ILM.getPreferredName()), is(false));
-                    assertThat(
+                assertThat(failureStoreRepresentation.get(Response.DataStreamInfo.ILM_POLICY_FIELD.getPreferredName()), is(nullValue()));
-                        failureStoreRepresentation.get(Response.DataStreamInfo.ILM_POLICY_FIELD.getPreferredName()),
-                        is(nullValue())
-                    );
                 assertThat(
                     failureStoreRepresentation.get(Response.DataStreamInfo.MANAGED_BY.getPreferredName()),
                     is(ManagedBy.UNMANAGED.displayValue)
@@ -245,7 +236,6 @@ public class GetDataStreamsResponseTests extends ESTestCase {
             }
         }
     }
-    }
 
     public void testManagedByDisplayValuesDontAccidentalyChange() {
         // UI might derive logic based on the display values so any changes should be coordinated with the UI team

modules/data-streams/src/yamlRestTest/java/org/elasticsearch/datastreams/DataStreamsClientYamlTestSuiteIT.java

@@ -20,8 +20,6 @@ import org.elasticsearch.test.rest.yaml.ClientYamlTestCandidate;
 import org.elasticsearch.test.rest.yaml.ESClientYamlSuiteTestCase;
 import org.junit.ClassRule;
 
-import static org.elasticsearch.test.cluster.FeatureFlag.FAILURE_STORE_ENABLED;
-
 public class DataStreamsClientYamlTestSuiteIT extends ESClientYamlSuiteTestCase {
 
     public DataStreamsClientYamlTestSuiteIT(final ClientYamlTestCandidate testCandidate) {
@@ -46,7 +44,6 @@ public class DataStreamsClientYamlTestSuiteIT extends ESClientYamlSuiteTestCase
     private static ElasticsearchCluster createCluster() {
         LocalClusterSpecBuilder<ElasticsearchCluster> clusterBuilder = ElasticsearchCluster.local()
             .distribution(DistributionType.DEFAULT)
-            .feature(FAILURE_STORE_ENABLED)
             .setting("xpack.security.enabled", "true")
             .keystore("bootstrap.password", "x-pack-test-password")
             .user("x_pack_rest_user", "x-pack-test-password")

modules/dot-prefix-validation/src/yamlRestTest/java/org/elasticsearch/validation/DotPrefixClientYamlTestSuiteIT.java

@@ -23,8 +23,6 @@ import org.junit.ClassRule;
 
 import java.util.Objects;
 
-import static org.elasticsearch.test.cluster.FeatureFlag.FAILURE_STORE_ENABLED;
-
 public class DotPrefixClientYamlTestSuiteIT extends ESClientYamlSuiteTestCase {
 
     public DotPrefixClientYamlTestSuiteIT(final ClientYamlTestCandidate testCandidate) {
@@ -49,7 +47,6 @@ public class DotPrefixClientYamlTestSuiteIT extends ESClientYamlSuiteTestCase {
     private static ElasticsearchCluster createCluster() {
         LocalClusterSpecBuilder<ElasticsearchCluster> clusterBuilder = ElasticsearchCluster.local()
             .distribution(DistributionType.DEFAULT)
-            .feature(FAILURE_STORE_ENABLED)
             .setting("xpack.security.enabled", "true")
             .keystore("bootstrap.password", "x-pack-test-password")
             .user("x_pack_rest_user", "x-pack-test-password");

qa/ccs-rolling-upgrade-remote-cluster/build.gradle

@@ -29,7 +29,6 @@ buildParams.bwcVersions.withWireCompatible { bwcVersion, baseName ->
     versions = [bwcVersion.toString(), project.version]
     setting 'cluster.remote.node.attr', 'gateway'
     setting 'xpack.security.enabled', 'false'
-    requiresFeature 'es.failure_store_feature_flag_enabled', new Version(8, 12, 0)
   }
   def remoteCluster = testClusters.register("${baseName}-remote") {
     numberOfNodes = 3
@@ -37,7 +36,6 @@ buildParams.bwcVersions.withWireCompatible { bwcVersion, baseName ->
     firstNode.setting 'node.attr.gateway', 'true'
     lastNode.setting 'node.attr.gateway', 'true'
     setting 'xpack.security.enabled', 'false'
-    requiresFeature 'es.failure_store_feature_flag_enabled', new Version(8, 12, 0)
   }
 
 

qa/full-cluster-restart/src/javaRestTest/java/org/elasticsearch/upgrades/FullClusterRestartArchivedSettingsIT.java

@@ -53,7 +53,6 @@ public class FullClusterRestartArchivedSettingsIT extends ParameterizedFullClust
         .setting("indices.memory.shard_inactive_time", "60m")
         .apply(() -> clusterConfig)
         .feature(FeatureFlag.TIME_SERIES_MODE)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .build();
 
     @ClassRule

qa/full-cluster-restart/src/javaRestTest/java/org/elasticsearch/upgrades/FullClusterRestartDownsampleIT.java

@@ -55,8 +55,7 @@ public class FullClusterRestartDownsampleIT extends ParameterizedFullClusterRest
             .setting("xpack.security.enabled", "false")
             .setting("indices.lifecycle.poll_interval", "5s")
             .apply(() -> clusterConfig)
-            .feature(FeatureFlag.TIME_SERIES_MODE)
+            .feature(FeatureFlag.TIME_SERIES_MODE);
-            .feature(FeatureFlag.FAILURE_STORE_ENABLED);
 
         if (oldVersion.before(Version.fromString("8.18.0"))) {
             cluster.jvmArg("-da:org.elasticsearch.index.mapper.DocumentMapper");

qa/full-cluster-restart/src/javaRestTest/java/org/elasticsearch/upgrades/FullClusterRestartIT.java

@@ -116,8 +116,7 @@ public class FullClusterRestartIT extends ParameterizedFullClusterRestartTestCas
             // some tests rely on the translog not being flushed
             .setting("indices.memory.shard_inactive_time", "60m")
             .apply(() -> clusterConfig)
-            .feature(FeatureFlag.TIME_SERIES_MODE)
+            .feature(FeatureFlag.TIME_SERIES_MODE);
-            .feature(FeatureFlag.FAILURE_STORE_ENABLED);
 
         if (oldVersion.before(Version.fromString("8.18.0"))) {
             cluster.jvmArg("-da:org.elasticsearch.index.mapper.DocumentMapper");

qa/full-cluster-restart/src/javaRestTest/java/org/elasticsearch/upgrades/QueryBuilderBWCIT.java

@@ -40,7 +40,6 @@ import org.elasticsearch.index.query.functionscore.FunctionScoreQueryBuilder;
 import org.elasticsearch.index.query.functionscore.RandomScoreFunctionBuilder;
 import org.elasticsearch.search.SearchModule;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.LocalClusterConfigProvider;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.xcontent.XContentBuilder;
@@ -78,7 +77,6 @@ public class QueryBuilderBWCIT extends ParameterizedFullClusterRestartTestCase {
         .version(org.elasticsearch.test.cluster.util.Version.fromString(OLD_CLUSTER_VERSION))
         .nodes(2)
         .setting("xpack.security.enabled", "false")
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .apply(() -> clusterConfig)
         .build();
 

rest-api-spec/src/main/resources/rest-api-spec/api/indices.delete_data_stream_options.json

@@ -4,9 +4,8 @@
       "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
       "description":"Deletes the data stream options of the selected data streams."
     },
-    "stability": "experimental",
+    "stability": "stable",
-    "visibility": "feature_flag",
+    "visibility": "public",
-    "feature_flag": "es.failure_store_feature_flag_enabled",
     "headers":{
       "accept": [ "application/json"]
     },

rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_data_stream_options.json

@@ -4,9 +4,8 @@
       "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
       "description":"Returns the data stream options of the selected data streams."
     },
-    "stability": "experimental",
+    "stability": "stable",
-    "visibility": "feature_flag",
+    "visibility": "public",
-    "feature_flag": "es.failure_store_feature_flag_enabled",
     "headers":{
       "accept": [ "application/json"]
     },

rest-api-spec/src/main/resources/rest-api-spec/api/indices.put_data_stream_options.json

@@ -4,9 +4,8 @@
       "url":"https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html",
       "description":"Updates the data stream options of the selected data streams."
     },
-    "stability": "experimental",
+    "stability": "stable",
-    "visibility": "feature_flag",
+    "visibility": "public",
-    "feature_flag": "es.failure_store_feature_flag_enabled",
     "headers":{
       "accept": [ "application/json"],
       "content_type": ["application/json"]

server/build.gradle

@@ -135,11 +135,9 @@ sourceSets.main.compiledBy(generateModulesList, generatePluginsList)
 if (buildParams.snapshotBuild == false) {
     tasks.named("test").configure {
         systemProperty 'es.index_mode_feature_flag_registered', 'true'
-        systemProperty 'es.failure_store_feature_flag_enabled', 'true'
     }
     tasks.named("internalClusterTest").configure {
         systemProperty 'es.index_mode_feature_flag_registered', 'true'
-        systemProperty 'es.failure_store_feature_flag_enabled', 'true'
     }
 }
 

server/src/main/java/org/elasticsearch/action/ResolvedIndices.java

@@ -11,7 +11,6 @@ package org.elasticsearch.action;
 
 import org.elasticsearch.action.search.SearchContextId;
 import org.elasticsearch.action.support.IndicesOptions;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.cluster.metadata.IndexMetadata;
 import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
 import org.elasticsearch.cluster.metadata.ProjectMetadata;
@@ -179,7 +178,6 @@ public class ResolvedIndices {
             : indexNameExpressionResolver.concreteIndices(projectMetadata, localIndices, startTimeInMillis);
 
         // prevent using selectors with remote cluster patterns
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         for (final var indicesPerRemoteClusterAlias : remoteClusterIndices.entrySet()) {
             final String[] indices = indicesPerRemoteClusterAlias.getValue().indices();
             if (indices != null) {
@@ -190,7 +188,6 @@ public class ResolvedIndices {
                 }
             }
         }
-        }
 
         return new ResolvedIndices(
             remoteClusterIndices,

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

@@ -222,7 +222,7 @@ final class BulkOperation extends ActionRunnable<BulkResponse> {
      */
     private void rollOverFailureStores(Runnable runnable) {
         // Skip allocation of some objects if we don't need to roll over anything.
-        if (failureStoresToBeRolledOver.isEmpty() || DataStream.isFailureStoreFeatureFlagEnabled() == false) {
+        if (failureStoresToBeRolledOver.isEmpty()) {
             runnable.run();
             return;
         }
@@ -423,7 +423,7 @@ final class BulkOperation extends ActionRunnable<BulkResponse> {
     }
 
     private void redirectFailuresOrCompleteBulkOperation() {
-        if (DataStream.isFailureStoreFeatureFlagEnabled() && failureStoreRedirects.isEmpty() == false) {
+        if (failureStoreRedirects.isEmpty() == false) {
             doRedirectFailures();
         } else {
             completeBulkOperation();
@@ -615,10 +615,7 @@ final class BulkOperation extends ActionRunnable<BulkResponse> {
      * @return a data stream if the write request points to a data stream, or {@code null} if it does not
      */
     private static DataStream getRedirectTargetCandidate(DocWriteRequest<?> docWriteRequest, ProjectMetadata project) {
-        // Feature flag guard
+        // PRTODO: We could check for cluster feature here instead
-        if (DataStream.isFailureStoreFeatureFlagEnabled() == false) {
-            return null;
-        }
         // If there is no index abstraction, then the request is using a pattern of some sort, which data streams do not support
         IndexAbstraction ia = project.getIndicesLookup().get(docWriteRequest.index());
         return DataStream.resolveDataStream(ia, project);

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

@@ -17,7 +17,6 @@ import org.elasticsearch.action.DocWriteRequest;
 import org.elasticsearch.action.DocWriteResponse;
 import org.elasticsearch.action.index.IndexRequest;
 import org.elasticsearch.action.update.UpdateResponse;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.cluster.metadata.IndexMetadata;
 import org.elasticsearch.common.util.set.Sets;
 import org.elasticsearch.core.Assertions;
@@ -218,13 +217,6 @@ final class BulkRequestModifier implements Iterator<DocWriteRequest<?>> {
      * @param e the failure encountered.
      */
     public void markItemForFailureStore(int slot, String targetIndexName, Exception e) {
-        if (DataStream.isFailureStoreFeatureFlagEnabled() == false) {
-            // Assert false for development, but if we somehow find ourselves here, default to failure logic.
-            assert false
-                : "Attempting to route a failed write request type to a failure store but the failure store is not enabled! "
-                    + "This should be guarded against in TransportBulkAction#shouldStoreFailure()";
-            markItemAsFailed(slot, e, IndexDocFailureStoreStatus.NOT_APPLICABLE_OR_UNKNOWN);
-        } else {
         // We get the index write request to find the source of the failed document
         IndexRequest indexRequest = TransportBulkAction.getIndexWriteRequest(bulkRequest.requests().get(slot));
         if (indexRequest == null) {
@@ -271,5 +263,4 @@ final class BulkRequestModifier implements Iterator<DocWriteRequest<?>> {
             }
         }
     }
-    }
 }

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

@@ -12,7 +12,6 @@ package org.elasticsearch.action.bulk;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.ExceptionsHelper;
 import org.elasticsearch.TransportVersions;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.io.stream.Writeable;
@@ -102,7 +101,7 @@ public enum IndexDocFailureStoreStatus implements ToXContentFragment, Writeable
     @Override
     public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
         // We avoid adding the not_applicable status in the response to not increase the size of bulk responses.
-        if (DataStream.isFailureStoreFeatureFlagEnabled() && this.equals(NOT_APPLICABLE_OR_UNKNOWN) == false) {
+        if (this.equals(NOT_APPLICABLE_OR_UNKNOWN) == false) {
             builder.field("failure_store", label);
         }
         return builder;

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

@@ -308,7 +308,6 @@ public class TransportBulkAction extends TransportAbstractBulkAction {
             index,
             projectState.metadata()
         );
-        boolean lazyRolloverFailureStoreFeature = DataStream.isFailureStoreFeatureFlagEnabled();
         Set<String> indicesThatRequireAlias = new HashSet<>();
 
         for (DocWriteRequest<?> request : bulkRequest.requests) {
@@ -356,7 +355,7 @@ public class TransportBulkAction extends TransportAbstractBulkAction {
             if (dataStream != null) {
                 if (writeToFailureStore == false && dataStream.getDataComponent().isRolloverOnWrite()) {
                     dataStreamsToBeRolledOver.add(request.index());
-                } else if (lazyRolloverFailureStoreFeature && writeToFailureStore && dataStream.getFailureComponent().isRolloverOnWrite()) {
+                } else if (writeToFailureStore && dataStream.getFailureComponent().isRolloverOnWrite()) {
                     failureStoresToBeRolledOver.add(request.index());
                 }
             }
@@ -627,9 +626,6 @@ public class TransportBulkAction extends TransportAbstractBulkAction {
      */
     // Visibility for testing
     Boolean resolveFailureInternal(String indexName, ProjectMetadata projectMetadata, long epochMillis) {
-        if (DataStream.isFailureStoreFeatureFlagEnabled() == false) {
-            return null;
-        }
         var resolution = resolveFailureStoreFromMetadata(indexName, projectMetadata, epochMillis);
         if (resolution != null) {
             return resolution;

server/src/main/java/org/elasticsearch/action/datastreams/GetDataStreamAction.java

@@ -416,17 +416,12 @@ public class GetDataStreamAction extends ActionType<GetDataStreamAction.Response
                     builder.endArray();
                     builder.endObject();
                 }
-                if (DataStream.isFailureStoreFeatureFlagEnabled()) {
                 builder.startObject(DataStream.FAILURE_STORE_FIELD.getPreferredName());
                 builder.field(FAILURE_STORE_ENABLED.getPreferredName(), failureStoreEffectivelyEnabled);
-                    builder.field(
+                builder.field(DataStream.ROLLOVER_ON_WRITE_FIELD.getPreferredName(), dataStream.getFailureComponent().isRolloverOnWrite());
-                        DataStream.ROLLOVER_ON_WRITE_FIELD.getPreferredName(),
-                        dataStream.getFailureComponent().isRolloverOnWrite()
-                    );
                 indicesToXContent(builder, dataStream.getFailureIndices());
                 addAutoShardingEvent(builder, params, dataStream.getFailureComponent().getAutoShardingEvent());
                 builder.endObject();
-                }
                 builder.endObject();
                 return builder;
             }

server/src/main/java/org/elasticsearch/action/index/IndexRequest.java

@@ -894,7 +894,7 @@ public class IndexRequest extends ReplicatedWriteRequest<IndexRequest> implement
 
     @Override
     public Index getConcreteWriteIndex(IndexAbstraction ia, ProjectMetadata project) {
-        if (DataStream.isFailureStoreFeatureFlagEnabled() && writeToFailureStore) {
+        if (writeToFailureStore) {
             if (ia.isDataStreamRelated() == false) {
                 throw new ElasticsearchException(
                     "Attempting to write a document to a failure store but the targeted index is not a data stream"

server/src/main/java/org/elasticsearch/action/support/IndicesOptions.java

@@ -10,7 +10,6 @@ package org.elasticsearch.action.support;
 
 import org.elasticsearch.ElasticsearchParseException;
 import org.elasticsearch.TransportVersions;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.logging.DeprecationCategory;
@@ -827,14 +826,14 @@ public record IndicesOptions(
      * @return Whether selectors (::) are allowed in the index expression.
      */
     public boolean allowSelectors() {
-        return DataStream.isFailureStoreFeatureFlagEnabled() && gatekeeperOptions.allowSelectors();
+        return gatekeeperOptions.allowSelectors();
     }
 
     /**
      * @return true when selectors should be included in the resolution, false otherwise.
      */
     public boolean includeFailureIndices() {
-        return DataStream.isFailureStoreFeatureFlagEnabled() && gatekeeperOptions.includeFailureIndices();
+        return gatekeeperOptions.includeFailureIndices();
     }
 
     /**
@@ -1135,19 +1134,6 @@ public record IndicesOptions(
     }
 
     public static IndicesOptions fromMap(Map<String, Object> map, IndicesOptions defaultSettings) {
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
-            return fromParameters(
-                map.containsKey(WildcardOptions.EXPAND_WILDCARDS) ? map.get(WildcardOptions.EXPAND_WILDCARDS) : map.get("expandWildcards"),
-                map.containsKey(ConcreteTargetOptions.IGNORE_UNAVAILABLE)
-                    ? map.get(ConcreteTargetOptions.IGNORE_UNAVAILABLE)
-                    : map.get("ignoreUnavailable"),
-                map.containsKey(WildcardOptions.ALLOW_NO_INDICES) ? map.get(WildcardOptions.ALLOW_NO_INDICES) : map.get("allowNoIndices"),
-                map.containsKey(GatekeeperOptions.IGNORE_THROTTLED)
-                    ? map.get(GatekeeperOptions.IGNORE_THROTTLED)
-                    : map.get("ignoreThrottled"),
-                defaultSettings
-            );
-        }
         return fromParameters(
             map.containsKey(WildcardOptions.EXPAND_WILDCARDS) ? map.get(WildcardOptions.EXPAND_WILDCARDS) : map.get("expandWildcards"),
             map.containsKey(ConcreteTargetOptions.IGNORE_UNAVAILABLE)
@@ -1469,11 +1455,10 @@ public record IndicesOptions(
             + ignoreAliases()
             + ", ignore_throttled="
             + ignoreThrottled()
-            // Until the feature flag is removed we access the field directly from the gatekeeper options.
+            + ", allow_selectors="
-            + (DataStream.isFailureStoreFeatureFlagEnabled() ? ", allow_selectors=" + gatekeeperOptions().allowSelectors() : "")
+            + allowSelectors()
-            + (DataStream.isFailureStoreFeatureFlagEnabled()
+            + ", include_failure_indices="
-                ? ", include_failure_indices=" + gatekeeperOptions().includeFailureIndices()
+            + includeFailureIndices()
-                : "")
             + ']';
     }
 }

server/src/main/java/org/elasticsearch/cluster/metadata/ComposableIndexTemplate.java

@@ -383,10 +383,8 @@ public class ComposableIndexTemplate implements SimpleDiffable<ComposableIndexTe
         static {
             PARSER.declareBoolean(ConstructingObjectParser.optionalConstructorArg(), HIDDEN);
             PARSER.declareBoolean(ConstructingObjectParser.optionalConstructorArg(), ALLOW_CUSTOM_ROUTING);
-            if (DataStream.isFailureStoreFeatureFlagEnabled()) {
             PARSER.declareBoolean(ConstructingObjectParser.optionalConstructorArg(), FAILURE_STORE);
         }
-        }
 
         private final boolean hidden;
         private final boolean allowCustomRouting;

server/src/main/java/org/elasticsearch/cluster/metadata/DataStream.java

@@ -33,7 +33,6 @@ import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.time.DateFormatter;
 import org.elasticsearch.common.time.DateFormatters;
-import org.elasticsearch.common.util.FeatureFlag;
 import org.elasticsearch.common.xcontent.XContentHelper;
 import org.elasticsearch.core.Nullable;
 import org.elasticsearch.core.TimeValue;
@@ -76,16 +75,11 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
 
     private static final Logger LOGGER = LogManager.getLogger(DataStream.class);
 
-    public static final boolean FAILURE_STORE_FEATURE_FLAG = new FeatureFlag("failure_store").isEnabled();
     public static final NodeFeature DATA_STREAM_FAILURE_STORE_FEATURE = new NodeFeature("data_stream.failure_store");
     public static final TransportVersion ADDED_FAILURE_STORE_TRANSPORT_VERSION = TransportVersions.V_8_12_0;
     public static final TransportVersion ADDED_AUTO_SHARDING_EVENT_VERSION = TransportVersions.V_8_14_0;
     public static final TransportVersion ADD_DATA_STREAM_OPTIONS_VERSION = TransportVersions.V_8_16_0;
 
-    public static boolean isFailureStoreFeatureFlagEnabled() {
-        return FAILURE_STORE_FEATURE_FLAG;
-    }
-
     public static final String BACKING_INDEX_PREFIX = ".ds-";
     public static final String FAILURE_STORE_PREFIX = ".fs-";
     public static final DateFormatter DATE_FORMATTER = DateFormatter.forPattern("uuuu.MM.dd");
@@ -214,7 +208,7 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
         var lifecycle = in.getTransportVersion().onOrAfter(TransportVersions.V_8_9_X)
             ? in.readOptionalWriteable(DataStreamLifecycle::new)
             : null;
-        // This boolean flag has been moved in data stream options
+        // TODO: clear out the failure_store field, which is redundant https://github.com/elastic/elasticsearch/issues/127071
         var failureStoreEnabled = in.getTransportVersion()
             .between(DataStream.ADDED_FAILURE_STORE_TRANSPORT_VERSION, TransportVersions.V_8_16_0) ? in.readBoolean() : false;
         var failureIndices = in.getTransportVersion().onOrAfter(DataStream.ADDED_FAILURE_STORE_TRANSPORT_VERSION)
@@ -942,8 +936,7 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
         }
 
         List<Index> reconciledFailureIndices = this.failureIndices.indices;
-        if (DataStream.isFailureStoreFeatureFlagEnabled()
+        if (isAnyIndexMissing(failureIndices.indices, snapshotMetadataBuilder, indicesInSnapshot)) {
-            && isAnyIndexMissing(failureIndices.indices, snapshotMetadataBuilder, indicesInSnapshot)) {
             reconciledFailureIndices = new ArrayList<>(this.failureIndices.indices);
             failureIndicesChanged = reconciledFailureIndices.removeIf(x -> indicesInSnapshot.contains(x.getName()) == false);
         }
@@ -1010,8 +1003,7 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
         LongSupplier nowSupplier,
         DataStreamGlobalRetention globalRetention
     ) {
-        if (DataStream.isFailureStoreFeatureFlagEnabled() == false
+        if (getFailuresLifecycle() == null
-            || getFailuresLifecycle() == null
             || getFailuresLifecycle().enabled() == false
             || getFailuresLifecycle().getEffectiveDataRetention(globalRetention, isInternal()) == null) {
             return List.of();
@@ -1252,6 +1244,7 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
         }
         if (out.getTransportVersion()
             .between(DataStream.ADDED_FAILURE_STORE_TRANSPORT_VERSION, DataStream.ADD_DATA_STREAM_OPTIONS_VERSION)) {
+            // TODO: clear out the failure_store field, which is redundant https://github.com/elastic/elasticsearch/issues/127071
             out.writeBoolean(isFailureStoreExplicitlyEnabled());
         }
         if (out.getTransportVersion().onOrAfter(DataStream.ADDED_FAILURE_STORE_TRANSPORT_VERSION)) {
@@ -1283,6 +1276,7 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
     public static final ParseField ALLOW_CUSTOM_ROUTING = new ParseField("allow_custom_routing");
     public static final ParseField INDEX_MODE = new ParseField("index_mode");
     public static final ParseField LIFECYCLE = new ParseField("lifecycle");
+    // TODO: clear out the failure_store field, which is redundant https://github.com/elastic/elasticsearch/issues/127071
     public static final ParseField FAILURE_STORE_FIELD = new ParseField("failure_store");
     public static final ParseField FAILURE_INDICES_FIELD = new ParseField("failure_indices");
     public static final ParseField ROLLOVER_ON_WRITE_FIELD = new ParseField("rollover_on_write");
@@ -1292,29 +1286,9 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
     public static final ParseField DATA_STREAM_OPTIONS_FIELD = new ParseField("options");
 
     @SuppressWarnings("unchecked")
-    private static final ConstructingObjectParser<DataStream, Void> PARSER = new ConstructingObjectParser<>("data_stream", args -> {
+    private static final ConstructingObjectParser<DataStream, Void> PARSER = new ConstructingObjectParser<>(
-        // Fields behind a feature flag need to be parsed last otherwise the parser will fail when the feature flag is disabled.
+        "data_stream",
-        // Until the feature flag is removed we keep them separately to be mindful of this.
+        args -> new DataStream(
-        boolean failureStoreEnabled = DataStream.isFailureStoreFeatureFlagEnabled() && args[12] != null && (boolean) args[12];
-        DataStreamIndices failureIndices = DataStream.isFailureStoreFeatureFlagEnabled()
-            ? new DataStreamIndices(
-                FAILURE_STORE_PREFIX,
-                args[13] != null ? (List<Index>) args[13] : List.of(),
-                args[14] != null && (boolean) args[14],
-                (DataStreamAutoShardingEvent) args[15]
-            )
-            : new DataStreamIndices(FAILURE_STORE_PREFIX, List.of(), false, null);
-        // We cannot distinguish if failure store was explicitly disabled or not. Given that failure store
-        // is still behind a feature flag in previous version we use the default value instead of explicitly disabling it.
-        DataStreamOptions dataStreamOptions = DataStreamOptions.EMPTY;
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
-            if (args[16] != null) {
-                dataStreamOptions = (DataStreamOptions) args[16];
-            } else if (failureStoreEnabled) {
-                dataStreamOptions = DataStreamOptions.FAILURE_STORE_ENABLED;
-            }
-        }
-        return new DataStream(
             (String) args[0],
             (Long) args[2],
             (Map<String, Object>) args[3],
@@ -1325,16 +1299,21 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
             args[7] != null && (boolean) args[7],
             args[8] != null ? IndexMode.fromString((String) args[8]) : null,
             (DataStreamLifecycle) args[9],
-            dataStreamOptions,
+            args[16] != null ? (DataStreamOptions) args[16] : DataStreamOptions.EMPTY,
             new DataStreamIndices(
                 BACKING_INDEX_PREFIX,
                 (List<Index>) args[1],
                 args[10] != null && (boolean) args[10],
                 (DataStreamAutoShardingEvent) args[11]
             ),
-            failureIndices
+            new DataStreamIndices(
+                FAILURE_STORE_PREFIX,
+                args[13] != null ? (List<Index>) args[13] : List.of(),
+                args[14] != null && (boolean) args[14],
+                (DataStreamAutoShardingEvent) args[15]
+            )
+        )
     );
-    });
 
     static {
         PARSER.declareString(ConstructingObjectParser.constructorArg(), NAME_FIELD);
@@ -1361,9 +1340,7 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
             (p, c) -> DataStreamAutoShardingEvent.fromXContent(p),
             AUTO_SHARDING_FIELD
         );
-        // The fields behind the feature flag should always be last.
+        // TODO: clear out the failure_store field, which is redundant https://github.com/elastic/elasticsearch/issues/127071
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
-            // Should be removed after backport
         PARSER.declareBoolean(ConstructingObjectParser.optionalConstructorArg(), FAILURE_STORE_FIELD);
         PARSER.declareObjectArray(
             ConstructingObjectParser.optionalConstructorArg(),
@@ -1382,7 +1359,6 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
             DATA_STREAM_OPTIONS_FIELD
         );
     }
-    }
 
     public static DataStream fromXContent(XContentParser parser) throws IOException {
         return PARSER.parse(parser, null);
@@ -1417,7 +1393,6 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
         builder.field(REPLICATED_FIELD.getPreferredName(), replicated);
         builder.field(SYSTEM_FIELD.getPreferredName(), system);
         builder.field(ALLOW_CUSTOM_ROUTING.getPreferredName(), allowCustomRouting);
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         if (failureIndices.indices.isEmpty() == false) {
             builder.xContentList(FAILURE_INDICES_FIELD.getPreferredName(), failureIndices.indices);
         }
@@ -1431,7 +1406,6 @@ public final class DataStream implements SimpleDiffable<DataStream>, ToXContentO
             builder.field(DATA_STREAM_OPTIONS_FIELD.getPreferredName());
             dataStreamOptions.toXContent(builder, params);
         }
-        }
         if (indexMode != null) {
             builder.field(INDEX_MODE.getPreferredName(), indexMode);
         }

server/src/main/java/org/elasticsearch/cluster/metadata/DataStreamAction.java

@@ -143,7 +143,7 @@ public class DataStreamAction implements Writeable, ToXContentObject {
         builder.startObject(type.fieldName);
         builder.field(DATA_STREAM.getPreferredName(), dataStream);
         builder.field(INDEX.getPreferredName(), index);
-        if (DataStream.isFailureStoreFeatureFlagEnabled() && failureStore) {
+        if (failureStore) {
             builder.field(FAILURE_STORE.getPreferredName(), failureStore);
         }
         builder.endObject();
@@ -181,14 +181,12 @@ public class DataStreamAction implements Writeable, ToXContentObject {
             ObjectParser.ValueType.STRING
         );
         ADD_BACKING_INDEX_PARSER.declareField(DataStreamAction::setIndex, XContentParser::text, INDEX, ObjectParser.ValueType.STRING);
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         ADD_BACKING_INDEX_PARSER.declareField(
             DataStreamAction::setFailureStore,
             XContentParser::booleanValue,
             FAILURE_STORE,
             ObjectParser.ValueType.BOOLEAN
         );
-        }
         REMOVE_BACKING_INDEX_PARSER.declareField(
             DataStreamAction::setDataStream,
             XContentParser::text,
@@ -196,7 +194,6 @@ public class DataStreamAction implements Writeable, ToXContentObject {
             ObjectParser.ValueType.STRING
         );
         REMOVE_BACKING_INDEX_PARSER.declareField(DataStreamAction::setIndex, XContentParser::text, INDEX, ObjectParser.ValueType.STRING);
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         REMOVE_BACKING_INDEX_PARSER.declareField(
             DataStreamAction::setFailureStore,
             XContentParser::booleanValue,
@@ -204,7 +201,6 @@ public class DataStreamAction implements Writeable, ToXContentObject {
             ObjectParser.ValueType.BOOLEAN
         );
     }
-    }
 
     private static ObjectParser<DataStreamAction, Void> parser(String name, Supplier<DataStreamAction> supplier) {
         ObjectParser<DataStreamAction, Void> parser = new ObjectParser<>(name, supplier);

server/src/main/java/org/elasticsearch/cluster/metadata/DataStreamFailureStoreSettings.java

@@ -46,12 +46,10 @@ public class DataStreamFailureStoreSettings {
      */
     public static DataStreamFailureStoreSettings create(ClusterSettings clusterSettings) {
         DataStreamFailureStoreSettings dataStreamFailureStoreSettings = new DataStreamFailureStoreSettings();
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         clusterSettings.initializeAndWatch(
             DATA_STREAM_FAILURE_STORED_ENABLED_SETTING,
             dataStreamFailureStoreSettings::setEnabledByNamePatterns
         );
-        }
         return dataStreamFailureStoreSettings;
     }
 
@@ -61,7 +59,6 @@ public class DataStreamFailureStoreSettings {
      * @param name The data stream name
      */
     public boolean failureStoreEnabledForDataStreamName(String name) {
-        assert DataStream.isFailureStoreFeatureFlagEnabled() : "Testing whether failure store is enabled should be behind by feature flag";
         return failureStoreEnabledByName.test(name);
     }
 

server/src/main/java/org/elasticsearch/cluster/metadata/MetadataCreateDataStreamService.java

@@ -422,10 +422,6 @@ public class MetadataCreateDataStreamService {
         String failureStoreIndexName,
         @Nullable BiConsumer<ProjectMetadata.Builder, IndexMetadata> metadataTransformer
     ) throws Exception {
-        if (DataStream.isFailureStoreFeatureFlagEnabled() == false) {
-            return currentState;
-        }
-
         var indexSettings = DataStreamFailureStoreDefinition.buildFailureStoreIndexSettings(nodeSettings);
 
         CreateIndexClusterStateUpdateRequest createIndexRequest = new CreateIndexClusterStateUpdateRequest(

server/src/main/java/org/elasticsearch/cluster/metadata/ProjectMetadata.java

@@ -1944,11 +1944,10 @@ public class ProjectMetadata implements Iterable<IndexMetadata>, Diffable<Projec
         private static boolean assertContainsIndexIfDataStream(DataStream parent, IndexMetadata indexMetadata) {
             assert parent == null
                 || parent.getIndices().stream().anyMatch(index -> indexMetadata.getIndex().getName().equals(index.getName()))
-                || (DataStream.isFailureStoreFeatureFlagEnabled()
+                || parent.getFailureComponent()
-                    && parent.getFailureComponent()
                     .getIndices()
                     .stream()
-                        .anyMatch(index -> indexMetadata.getIndex().getName().equals(index.getName())))
+                    .anyMatch(index -> indexMetadata.getIndex().getName().equals(index.getName()))
                 : "Expected data stream [" + parent.getName() + "] to contain index " + indexMetadata.getIndex();
             return true;
         }
@@ -1970,13 +1969,11 @@ public class ProjectMetadata implements Iterable<IndexMetadata>, Diffable<Projec
                 for (Index i : dataStream.getIndices()) {
                     indexToDataStreamLookup.put(i.getName(), dataStream);
                 }
-                if (DataStream.isFailureStoreFeatureFlagEnabled()) {
                 for (Index i : dataStream.getFailureIndices()) {
                     indexToDataStreamLookup.put(i.getName(), dataStream);
                 }
             }
         }
-        }
 
         private static IndexAbstraction.Alias makeDsAliasAbstraction(Map<String, DataStream> dataStreams, DataStreamAlias alias) {
             Index writeIndexOfWriteDataStream = null;

server/src/main/java/org/elasticsearch/cluster/metadata/Template.java

@@ -314,9 +314,7 @@ public class Template implements SimpleDiffable<Template>, ToXContentObject {
             builder.field(LIFECYCLE.getPreferredName());
             lifecycle.toXContent(builder, params, rolloverConfiguration, null, false);
         }
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         dataStreamOptions.toXContent(builder, params, DATA_STREAM_OPTIONS.getPreferredName());
-        }
         builder.endObject();
         return builder;
     }

server/src/main/java/org/elasticsearch/common/settings/ClusterSettings.java

@@ -38,7 +38,6 @@ import org.elasticsearch.cluster.coordination.LeaderChecker;
 import org.elasticsearch.cluster.coordination.MasterHistory;
 import org.elasticsearch.cluster.coordination.NoMasterBlockService;
 import org.elasticsearch.cluster.coordination.Reconfigurator;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.cluster.metadata.DataStreamFailureStoreSettings;
 import org.elasticsearch.cluster.metadata.DataStreamGlobalRetentionSettings;
 import org.elasticsearch.cluster.metadata.DataStreamLifecycle;
@@ -139,12 +138,8 @@ import org.elasticsearch.transport.TransportService;
 import org.elasticsearch.transport.TransportSettings;
 import org.elasticsearch.watcher.ResourceWatcherService;
 
-import java.util.Objects;
 import java.util.Set;
 import java.util.function.Predicate;
-import java.util.stream.Stream;
-
-import static java.util.stream.Collectors.toSet;
 
 /**
  * Encapsulates all valid cluster level settings.
@@ -215,7 +210,7 @@ public final class ClusterSettings extends AbstractScopedSettings {
         }
     }
 
-    public static final Set<Setting<?>> BUILT_IN_CLUSTER_SETTINGS = Stream.of(
+    public static final Set<Setting<?>> BUILT_IN_CLUSTER_SETTINGS = Set.of(
         AllocationBalancingRoundSummaryService.ENABLE_BALANCER_ROUND_SUMMARIES_SETTING,
         AllocationBalancingRoundSummaryService.BALANCER_ROUND_SUMMARIES_LOG_INTERVAL_SETTING,
         AwarenessAllocationDecider.CLUSTER_ROUTING_ALLOCATION_AWARENESS_ATTRIBUTE_SETTING,
@@ -637,8 +632,8 @@ public final class ClusterSettings extends AbstractScopedSettings {
         DataStreamGlobalRetentionSettings.DATA_STREAMS_DEFAULT_RETENTION_SETTING,
         DataStreamGlobalRetentionSettings.DATA_STREAMS_MAX_RETENTION_SETTING,
         ShardsAvailabilityHealthIndicatorService.REPLICA_UNASSIGNED_BUFFER_TIME,
-        DataStream.isFailureStoreFeatureFlagEnabled() ? DataStreamFailureStoreSettings.DATA_STREAM_FAILURE_STORED_ENABLED_SETTING : null,
+        DataStreamFailureStoreSettings.DATA_STREAM_FAILURE_STORED_ENABLED_SETTING,
         IndexingStatsSettings.RECENT_WRITE_LOAD_HALF_LIFE_SETTING,
         TransportGetAllocationStatsAction.CACHE_TTL_SETTING
-    ).filter(Objects::nonNull).collect(toSet());
+    );
 }

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

@@ -12,7 +12,6 @@ package org.elasticsearch.rest.action.admin.indices;
 import org.elasticsearch.action.admin.indices.template.put.PutComponentTemplateAction;
 import org.elasticsearch.client.internal.node.NodeClient;
 import org.elasticsearch.cluster.metadata.ComponentTemplate;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.rest.BaseRestHandler;
 import org.elasticsearch.rest.RestRequest;
 import org.elasticsearch.rest.Scope;
@@ -59,6 +58,6 @@ public class RestPutComponentTemplateAction extends BaseRestHandler {
 
     @Override
     public Set<String> supportedCapabilities() {
-        return DataStream.isFailureStoreFeatureFlagEnabled() ? capabilities : Set.of();
+        return capabilities;
     }
 }

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

@@ -12,7 +12,6 @@ package org.elasticsearch.rest.action.admin.indices;
 import org.elasticsearch.action.admin.indices.template.put.TransportPutComposableIndexTemplateAction;
 import org.elasticsearch.client.internal.node.NodeClient;
 import org.elasticsearch.cluster.metadata.ComposableIndexTemplate;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.rest.BaseRestHandler;
 import org.elasticsearch.rest.RestRequest;
 import org.elasticsearch.rest.Scope;
@@ -61,6 +60,6 @@ public class RestPutComposableIndexTemplateAction extends BaseRestHandler {
 
     @Override
     public Set<String> supportedCapabilities() {
-        return DataStream.isFailureStoreFeatureFlagEnabled() ? capabilities : Set.of();
+        return capabilities;
     }
 }

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

@@ -12,7 +12,6 @@ package org.elasticsearch.rest.action.admin.indices;
 import org.elasticsearch.action.admin.indices.rollover.RolloverRequest;
 import org.elasticsearch.action.support.ActiveShardCount;
 import org.elasticsearch.client.internal.node.NodeClient;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.rest.BaseRestHandler;
 import org.elasticsearch.rest.RestRequest;
 import org.elasticsearch.rest.Scope;
@@ -43,11 +42,7 @@ public class RestRolloverIndexAction extends BaseRestHandler {
 
     @Override
     public Set<String> supportedCapabilities() {
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         return Set.of("return-404-on-missing-target", "index_expression_selectors");
-        } else {
-            return Set.of("return-404-on-missing-target");
-        }
     }
 
     @Override

server/src/main/java/org/elasticsearch/rest/action/document/RestBulkAction.java

@@ -18,7 +18,6 @@ import org.elasticsearch.action.bulk.BulkShardRequest;
 import org.elasticsearch.action.bulk.IncrementalBulkService;
 import org.elasticsearch.action.support.ActiveShardCount;
 import org.elasticsearch.client.internal.node.NodeClient;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.common.bytes.BytesReference;
 import org.elasticsearch.common.bytes.CompositeBytesReference;
 import org.elasticsearch.common.bytes.ReleasableBytesReference;
@@ -69,7 +68,7 @@ public class RestBulkAction extends BaseRestHandler {
     public RestBulkAction(Settings settings, IncrementalBulkService bulkHandler) {
         this.allowExplicitIndex = MULTI_ALLOW_EXPLICIT_INDEX.get(settings);
         this.bulkHandler = bulkHandler;
-        this.capabilities = DataStream.isFailureStoreFeatureFlagEnabled() ? Set.of(FAILURE_STORE_STATUS_CAPABILITY) : Set.of();
+        this.capabilities = Set.of(FAILURE_STORE_STATUS_CAPABILITY);
     }
 
     @Override

server/src/main/java/org/elasticsearch/rest/action/document/RestIndexAction.java

@@ -15,7 +15,6 @@ import org.elasticsearch.action.DocWriteResponse;
 import org.elasticsearch.action.index.IndexRequest;
 import org.elasticsearch.action.support.ActiveShardCount;
 import org.elasticsearch.client.internal.node.NodeClient;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.common.bytes.ReleasableBytesReference;
 import org.elasticsearch.index.VersionType;
 import org.elasticsearch.rest.BaseRestHandler;
@@ -40,9 +39,7 @@ public class RestIndexAction extends BaseRestHandler {
     static final String TYPES_DEPRECATION_MESSAGE = "[types removal] Specifying types in document "
         + "index requests is deprecated, use the typeless endpoints instead (/{index}/_doc/{id}, /{index}/_doc, "
         + "or /{index}/_create/{id}).";
-    private final Set<String> capabilities = DataStream.isFailureStoreFeatureFlagEnabled()
+    private final Set<String> capabilities = Set.of(FAILURE_STORE_STATUS_CAPABILITY);
-        ? Set.of(FAILURE_STORE_STATUS_CAPABILITY)
-        : Set.of();
 
     @Override
     public List<Route> routes() {

server/src/main/java/org/elasticsearch/snapshots/RestoreService.java

@@ -425,13 +425,10 @@ public final class RestoreService implements ClusterStateApplier {
                 .stream()
                 .flatMap(ds -> ds.getIndices().stream().map(idx -> new Tuple<>(ds.isSystem(), idx.getName())))
                 .collect(Collectors.partitioningBy(Tuple::v1, Collectors.mapping(Tuple::v2, Collectors.toSet())));
-            Map<Boolean, Set<String>> failureIndices = Map.of();
+            Map<Boolean, Set<String>> failureIndices = dataStreamsToRestore.values()
-            if (DataStream.isFailureStoreFeatureFlagEnabled()) {
-                failureIndices = dataStreamsToRestore.values()
                 .stream()
                 .flatMap(ds -> ds.getFailureIndices().stream().map(idx -> new Tuple<>(ds.isSystem(), idx.getName())))
                 .collect(Collectors.partitioningBy(Tuple::v1, Collectors.mapping(Tuple::v2, Collectors.toSet())));
-            }
             systemDataStreamIndices = Sets.union(backingIndices.getOrDefault(true, Set.of()), failureIndices.getOrDefault(true, Set.of()));
             nonSystemDataStreamBackingIndices = backingIndices.getOrDefault(false, Set.of());
             nonSystemDataStreamFailureIndices = failureIndices.getOrDefault(false, Set.of());
@@ -812,13 +809,11 @@ public final class RestoreService implements ClusterStateApplier {
             .stream()
             .map(i -> metadata.get(renameIndex(i.getName(), request, true, false)).getIndex())
             .toList();
-        List<Index> updatedFailureIndices = DataStream.isFailureStoreFeatureFlagEnabled()
+        List<Index> updatedFailureIndices = dataStream.getFailureComponent()
-            ? dataStream.getFailureComponent()
             .getIndices()
             .stream()
             .map(i -> metadata.get(renameIndex(i.getName(), request, false, true)).getIndex())
-                .toList()
+            .toList();
-            : List.of();
         return dataStream.copy()
             .setName(dataStreamName)
             .setBackingIndices(dataStream.getDataComponent().copy().setIndices(updatedIndices).build())

server/src/test/java/org/elasticsearch/action/bulk/BulkOperationTests.java

@@ -60,7 +60,6 @@ import org.elasticsearch.test.client.NoOpNodeClient;
 import org.elasticsearch.threadpool.TestThreadPool;
 import org.elasticsearch.threadpool.ThreadPool;
 import org.junit.After;
-import org.junit.Assume;
 import org.junit.Before;
 
 import java.io.IOException;
@@ -392,8 +391,6 @@ public class BulkOperationTests extends ESTestCase {
      * A bulk operation to a data stream with a failure store enabled should redirect any shard level failures to the failure store.
      */
     public void testFailingEntireShardRedirectsToFailureStore() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         // Requests that go to two separate shards
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(new IndexRequest(fsDataStreamName).id("1").source(Map.of("key", "val")).opType(DocWriteRequest.OpType.CREATE));
@@ -419,8 +416,6 @@ public class BulkOperationTests extends ESTestCase {
      * failure store.
      */
     public void testFailingDocumentRedirectsToFailureStore() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         // Requests that go to two separate shards
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(new IndexRequest(fsDataStreamName).id("1").source(Map.of("key", "val")).opType(DocWriteRequest.OpType.CREATE));
@@ -446,8 +441,6 @@ public class BulkOperationTests extends ESTestCase {
      * failure store if the failure store node feature is not on every node in the cluster
      */
     public void testFailingDocumentIgnoredByFailureStoreWhenFeatureIsDisabled() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         // Requests that go to two separate shards
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(new IndexRequest(fsDataStreamName).id("1").source(Map.of("key", "val")).opType(DocWriteRequest.OpType.CREATE));
@@ -481,8 +474,6 @@ public class BulkOperationTests extends ESTestCase {
     }
 
     public void testFailingDocumentRedirectsToFailureStoreWhenEnabledByClusterSetting() {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(
             new IndexRequest(fsBySettingsDataStreamName).id("1").source(Map.of("key", "val")).opType(DocWriteRequest.OpType.CREATE)
@@ -538,8 +529,6 @@ public class BulkOperationTests extends ESTestCase {
      * a shard-level failure while writing to the failure store indices.
      */
     public void testFailureStoreShardFailureRejectsDocument() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         // Requests that go to two separate shards
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(new IndexRequest(fsDataStreamName).id("1").source(Map.of("key", "val")).opType(DocWriteRequest.OpType.CREATE));
@@ -578,8 +567,6 @@ public class BulkOperationTests extends ESTestCase {
      * instead will simply report its original failure in the response, with the conversion failure present as a suppressed exception.
      */
     public void testFailedDocumentCanNotBeConvertedFails() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         // Requests that go to two separate shards
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(new IndexRequest(fsDataStreamName).id("1").source(Map.of("key", "val")).opType(DocWriteRequest.OpType.CREATE));
@@ -614,8 +601,6 @@ public class BulkOperationTests extends ESTestCase {
      * returns an unblocked cluster, the redirection of failure documents should proceed and not return early.
      */
     public void testRetryableBlockAcceptsFailureStoreDocument() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         // Requests that go to two separate shards
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(new IndexRequest(fsDataStreamName).id("1").source(Map.of("key", "val")).opType(DocWriteRequest.OpType.CREATE));
@@ -707,8 +692,6 @@ public class BulkOperationTests extends ESTestCase {
      * non-retryable block when the redirected documents would be sent to the shard-level action.
      */
     public void testBlockedClusterRejectsFailureStoreDocument() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         // Requests that go to two separate shards
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(new IndexRequest(fsDataStreamName).id("1").source(Map.of("key", "val")).opType(DocWriteRequest.OpType.CREATE));
@@ -760,8 +743,6 @@ public class BulkOperationTests extends ESTestCase {
      * retryable block to clear when the redirected documents would be sent to the shard-level action.
      */
     public void testOperationTimeoutRejectsFailureStoreDocument() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         // Requests that go to two separate shards
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(new IndexRequest(fsDataStreamName).id("1").source(Map.of("key", "val")).opType(DocWriteRequest.OpType.CREATE));
@@ -821,8 +802,6 @@ public class BulkOperationTests extends ESTestCase {
      * for a retryable block to clear when the redirected documents would be sent to the shard-level action.
      */
     public void testNodeClosureRejectsFailureStoreDocument() {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         // Requests that go to two separate shards
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(new IndexRequest(fsDataStreamName).id("1").source(Map.of("key", "val")).opType(DocWriteRequest.OpType.CREATE));
@@ -866,8 +845,6 @@ public class BulkOperationTests extends ESTestCase {
      * rollover, it first needs to roll over the failure store and then redirect the failure to the <i>new</i> failure index.
      */
     public void testLazilyRollingOverFailureStore() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         // Requests that go to two separate shards
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(
@@ -925,8 +902,6 @@ public class BulkOperationTests extends ESTestCase {
      * should be added to the list of suppressed causes in the <code>BulkItemResponse</code>.
      */
     public void testFailureWhileRollingOverFailureStore() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         // Requests that go to two separate shards
         BulkRequest bulkRequest = new BulkRequest();
         bulkRequest.add(

server/src/test/java/org/elasticsearch/action/bulk/TransportBulkActionTests.java

@@ -90,7 +90,6 @@ import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.greaterThan;
 import static org.hamcrest.Matchers.is;
 import static org.hamcrest.Matchers.nullValue;
-import static org.junit.Assume.assumeThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
@@ -453,8 +452,6 @@ public class TransportBulkActionTests extends ESTestCase {
     }
 
     public void testResolveFailureStoreFromMetadata() throws Exception {
-        assumeThat(DataStream.isFailureStoreFeatureFlagEnabled(), is(true));
-
         String dataStreamWithFailureStoreEnabled = "test-data-stream-failure-enabled";
         String dataStreamWithFailureStoreDefault = "test-data-stream-failure-default";
         String dataStreamWithFailureStoreDisabled = "test-data-stream-failure-disabled";
@@ -544,8 +541,6 @@ public class TransportBulkActionTests extends ESTestCase {
     }
 
     public void testResolveFailureStoreFromTemplate() throws Exception {
-        assumeThat(DataStream.isFailureStoreFeatureFlagEnabled(), is(true));
-
         String dsTemplateWithFailureStoreEnabled = "test-data-stream-failure-enabled";
         String dsTemplateWithFailureStoreDefault = "test-data-stream-failure-default";
         String dsTemplateWithFailureStoreDisabled = "test-data-stream-failure-disabled";

test/framework/src/main/java/org/elasticsearch/cluster/metadata/DataStreamTestHelper.java

@@ -491,12 +491,7 @@ public final class DataStreamTestHelper {
             "template_1",
             ComposableIndexTemplate.builder()
                 .indexPatterns(List.of("*"))
-                .template(
+                .template(Template.builder().dataStreamOptions(createDataStreamOptionsTemplate(storeFailures)))
-                    Template.builder()
-                        .dataStreamOptions(
-                            DataStream.isFailureStoreFeatureFlagEnabled() ? createDataStreamOptionsTemplate(storeFailures) : null
-                        )
-                )
                 .dataStreamTemplate(new ComposableIndexTemplate.DataStreamTemplate())
                 .build()
         );
@@ -512,7 +507,7 @@ public final class DataStreamTestHelper {
             allIndices.addAll(backingIndices);
 
             List<IndexMetadata> failureStores = new ArrayList<>();
-            if (DataStream.isFailureStoreFeatureFlagEnabled() && Boolean.TRUE.equals(storeFailures)) {
+            if (Boolean.TRUE.equals(storeFailures)) {
                 for (int failureStoreNumber = 1; failureStoreNumber <= dsTuple.v2(); failureStoreNumber++) {
                     failureStores.add(
                         createIndexMetadata(

test/test-clusters/src/main/java/org/elasticsearch/test/cluster/FeatureFlag.java

@@ -17,7 +17,6 @@ import org.elasticsearch.test.cluster.util.Version;
  */
 public enum FeatureFlag {
     TIME_SERIES_MODE("es.index_mode_feature_flag_registered=true", Version.fromString("8.0.0"), null),
-    FAILURE_STORE_ENABLED("es.failure_store_feature_flag_enabled=true", Version.fromString("8.12.0"), null),
     SUB_OBJECTS_AUTO_ENABLED("es.sub_objects_auto_feature_flag_enabled=true", Version.fromString("8.16.0"), null),
     DOC_VALUES_SKIPPER("es.doc_values_skipper_feature_flag_enabled=true", Version.fromString("8.18.1"), null),
     USE_LUCENE101_POSTINGS_FORMAT("es.use_lucene101_postings_format_feature_flag_enabled=true", Version.fromString("9.1.0"), null);

x-pack/plugin/core/build.gradle

@@ -153,12 +153,6 @@ tasks.named("javaRestTest") {
   usesDefaultDistribution("uses the _xpack api")
 }
 
-if (buildParams.snapshotBuild == false) {
-  tasks.withType(Test).configureEach {
-    systemProperty 'es.failure_store_feature_flag_enabled', 'true'
-  }
-}
-
 if (buildParams.inFipsJvm) {
   // Test clusters run with security disabled
   tasks.named("javaRestTest").configure { enabled = false }

x-pack/plugin/core/src/javaRestTest/java/org/elasticsearch/xpack/core/DataStreamRestIT.java

@@ -14,7 +14,6 @@ import org.elasticsearch.common.settings.SecureString;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.ThreadContext;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.elasticsearch.xcontent.XContentParser;
@@ -37,7 +36,6 @@ public class DataStreamRestIT extends ESRestTestCase {
         .setting("xpack.security.enabled", "true")
         .setting("xpack.license.self_generated.type", "trial")
         .setting("indices.lifecycle.history_index_enabled", "false")
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .keystore("bootstrap.password", "x-pack-test-password")
         .user("x_pack_rest_user", "x-pack-test-password")
         .systemProperty("es.queryable_built_in_roles_enabled", "false")

x-pack/plugin/core/src/javaRestTest/java/org/elasticsearch/xpack/core/LicenseInstallationIT.java

@@ -19,7 +19,6 @@ import org.elasticsearch.license.License;
 import org.elasticsearch.license.LicenseSettings;
 import org.elasticsearch.license.TestUtils;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.elasticsearch.xcontent.ToXContent;
 import org.elasticsearch.xcontent.XContentBuilder;
@@ -46,7 +45,6 @@ public class LicenseInstallationIT extends ESRestTestCase {
     public static ElasticsearchCluster cluster = ElasticsearchCluster.local()
         .setting("xpack.security.enabled", "true")
         .setting("xpack.license.self_generated.type", "trial")
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .keystore("bootstrap.password", "x-pack-test-password")
         .user("x_pack_rest_user", "x-pack-test-password")
         .systemProperty("es.queryable_built_in_roles_enabled", "false")

x-pack/plugin/core/src/javaRestTest/java/org/elasticsearch/xpack/core/StackTemplatesRestIT.java

@@ -13,7 +13,6 @@ import org.elasticsearch.common.settings.SecureString;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.ThreadContext;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.junit.ClassRule;
@@ -27,7 +26,6 @@ public class StackTemplatesRestIT extends ESRestTestCase {
         .distribution(DistributionType.DEFAULT)
         .setting("xpack.security.enabled", "true")
         .setting("xpack.license.self_generated.type", "trial")
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .keystore("bootstrap.password", "x-pack-test-password")
         .user("x_pack_rest_user", "x-pack-test-password")
         .systemProperty("es.queryable_built_in_roles_enabled", "false")

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/action/DataStreamUsageTransportAction.java

@@ -52,7 +52,6 @@ public class DataStreamUsageTransportAction extends XPackUsageFeatureTransportAc
         long failureIndicesCounter = 0;
         for (DataStream ds : dataStreams.values()) {
             backingIndicesCounter += ds.getIndices().size();
-            if (DataStream.isFailureStoreFeatureFlagEnabled()) {
             if (ds.isFailureStoreExplicitlyEnabled()) {
                 failureStoreExplicitlyEnabledCounter++;
             }
@@ -63,7 +62,6 @@ public class DataStreamUsageTransportAction extends XPackUsageFeatureTransportAc
                 failureIndicesCounter += ds.getFailureIndices().size();
             }
         }
-        }
         final DataStreamFeatureSetUsage.DataStreamStats stats = new DataStreamFeatureSetUsage.DataStreamStats(
             dataStreams.size(),
             backingIndicesCounter,

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/datastreams/DataStreamFeatureSetUsage.java

@@ -9,7 +9,6 @@ package org.elasticsearch.xpack.core.datastreams;
 
 import org.elasticsearch.TransportVersion;
 import org.elasticsearch.TransportVersions;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
@@ -50,14 +49,12 @@ public class DataStreamFeatureSetUsage extends XPackFeatureUsage {
         super.innerXContent(builder, params);
         builder.field("data_streams", streamStats.totalDataStreamCount);
         builder.field("indices_count", streamStats.indicesBehindDataStream);
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         builder.startObject("failure_store");
         builder.field("explicitly_enabled_count", streamStats.failureStoreExplicitlyEnabledDataStreamCount);
         builder.field("effectively_enabled_count", streamStats.failureStoreEffectivelyEnabledDataStreamCount);
         builder.field("failure_indices_count", streamStats.failureStoreIndicesCount);
         builder.endObject();
     }
-    }
 
     @Override
     public String toString() {

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/action/role/RoleDescriptorRequestValidator.java

@@ -8,7 +8,6 @@
 package org.elasticsearch.xpack.core.security.action.role;
 
 import org.elasticsearch.action.ActionRequestValidationException;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
 import org.elasticsearch.xpack.core.security.authz.RoleDescriptor;
 import org.elasticsearch.xpack.core.security.authz.privilege.ApplicationPrivilege;
@@ -55,13 +54,11 @@ public class RoleDescriptorRequestValidator {
                 } catch (IllegalArgumentException ile) {
                     validationException = addValidationError(ile.getMessage(), validationException);
                 }
-                if (DataStream.isFailureStoreFeatureFlagEnabled()) {
                 for (final String indexName : idp.getIndices()) {
                     validationException = validateIndexNameExpression(indexName, validationException);
                 }
             }
         }
-        }
         final RoleDescriptor.RemoteIndicesPrivileges[] remoteIndicesPrivileges = roleDescriptor.getRemoteIndicesPrivileges();
         for (RoleDescriptor.RemoteIndicesPrivileges ridp : remoteIndicesPrivileges) {
             if (Arrays.asList(ridp.remoteClusters()).contains("")) {
@@ -78,12 +75,10 @@ public class RoleDescriptorRequestValidator {
             } catch (IllegalArgumentException ile) {
                 validationException = addValidationError(ile.getMessage(), validationException);
             }
-            if (DataStream.isFailureStoreFeatureFlagEnabled()) {
             for (String indexName : ridp.indicesPrivileges().getIndices()) {
                 validationException = validateIndexNameExpression(indexName, validationException);
             }
         }
-        }
         if (roleDescriptor.hasRemoteClusterPermissions()) {
             try {
                 roleDescriptor.getRemoteClusterPermissions().validate();

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/AuthorizationEngine.java

@@ -13,7 +13,6 @@ import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.IndicesRequest;
 import org.elasticsearch.action.support.IndexComponentSelector;
 import org.elasticsearch.action.support.SubscribableListener;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.cluster.metadata.IndexAbstraction;
 import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
 import org.elasticsearch.cluster.metadata.ProjectMetadata;
@@ -348,7 +347,6 @@ public interface AuthorizationEngine {
                             validationException
                         );
                     }
-                    if (DataStream.isFailureStoreFeatureFlagEnabled()) {
                     // best effort prevent users from attempting to use selectors in privilege check
                     for (String indexPattern : indicesPrivileges.getIndices()) {
                         if (IndexNameExpressionResolver.hasSelector(indexPattern, IndexComponentSelector.FAILURES)
@@ -362,7 +360,6 @@ public interface AuthorizationEngine {
                     }
                 }
             }
-            }
             if (application == null) {
                 validationException = addValidationError("applicationPrivileges must not be null", validationException);
             } else {

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/authz/privilege/IndexPrivilege.java

@@ -32,7 +32,6 @@ import org.elasticsearch.action.datastreams.PromoteDataStreamAction;
 import org.elasticsearch.action.fieldcaps.TransportFieldCapabilitiesAction;
 import org.elasticsearch.action.search.TransportSearchShardsAction;
 import org.elasticsearch.action.support.IndexComponentSelector;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.util.set.Sets;
 import org.elasticsearch.core.Nullable;
@@ -52,7 +51,6 @@ import java.util.HashSet;
 import java.util.LinkedHashMap;
 import java.util.Locale;
 import java.util.Map;
-import java.util.Objects;
 import java.util.Set;
 import java.util.SortedMap;
 import java.util.concurrent.ConcurrentHashMap;
@@ -238,10 +236,8 @@ public final class IndexPrivilege extends Privilege {
      */
     private static final Map<String, IndexPrivilege> VALUES = combineSortedInOrder(
         sortByAccessLevel(
-            Stream.of(
+            Stream.of(entry("read_failure_store", READ_FAILURE_STORE), entry("manage_failure_store", MANAGE_FAILURE_STORE))
-                DataStream.isFailureStoreFeatureFlagEnabled() ? entry("read_failure_store", READ_FAILURE_STORE) : null,
+                .collect(Collectors.toUnmodifiableMap(Map.Entry::getKey, Map.Entry::getValue))
-                DataStream.isFailureStoreFeatureFlagEnabled() ? entry("manage_failure_store", MANAGE_FAILURE_STORE) : null
-            ).filter(Objects::nonNull).collect(Collectors.toUnmodifiableMap(Map.Entry::getKey, Map.Entry::getValue))
         ),
         sortByAccessLevel(
             Stream.of(

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/security/user/InternalUsers.java

@@ -28,7 +28,6 @@ import org.elasticsearch.action.downsample.DownsampleAction;
 import org.elasticsearch.action.index.TransportIndexAction;
 import org.elasticsearch.action.search.TransportSearchAction;
 import org.elasticsearch.action.search.TransportSearchScrollAction;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.index.reindex.ReindexAction;
 import org.elasticsearch.xpack.core.XPackPlugin;
 import org.elasticsearch.xpack.core.ilm.action.ILMActions;
@@ -161,7 +160,7 @@ public class InternalUsers {
                     .privileges(
                         filterNonNull(
                             // needed to rollover failure store
-                            DataStream.isFailureStoreFeatureFlagEnabled() ? "manage_failure_store" : null,
+                            "manage_failure_store",
                             "delete_index",
                             RolloverAction.NAME,
                             ForceMergeAction.NAME + "*",
@@ -184,7 +183,7 @@ public class InternalUsers {
                     .privileges(
                         filterNonNull(
                             // needed to rollover failure store
-                            DataStream.isFailureStoreFeatureFlagEnabled() ? "manage_failure_store" : null,
+                            "manage_failure_store",
                             "delete_index",
                             RolloverAction.NAME,
                             ForceMergeAction.NAME + "*",
@@ -262,7 +261,7 @@ public class InternalUsers {
                     .privileges(
                         filterNonNull(
                             // needed to rollover failure store
-                            DataStream.isFailureStoreFeatureFlagEnabled() ? "manage_failure_store" : null,
+                            "manage_failure_store",
                             LazyRolloverAction.NAME
                         )
                     )

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/action/role/PutRoleRequestTests.java

@@ -8,7 +8,6 @@ package org.elasticsearch.xpack.core.security.action.role;
 
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.support.WriteRequest;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.test.ESTestCase;
 import org.elasticsearch.xpack.core.security.authz.RoleDescriptor.ApplicationResourcePrivileges;
 import org.elasticsearch.xpack.core.security.authz.permission.RemoteClusterPermissionGroup;
@@ -50,7 +49,6 @@ public class PutRoleRequestTests extends ESTestCase {
     }
 
     public void testValidationErrorWithFailureStorePrivilegeInRemoteIndices() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         final PutRoleRequest request = new PutRoleRequest();
         request.name(randomAlphaOfLengthBetween(4, 9));
         request.addRemoteIndex(

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/action/role/RoleDescriptorRequestValidatorTests.java

@@ -7,7 +7,6 @@
 
 package org.elasticsearch.xpack.core.security.action.role;
 
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.test.ESTestCase;
 import org.elasticsearch.xpack.core.security.authz.RoleDescriptor;
 import org.elasticsearch.xpack.core.security.authz.RoleDescriptor.IndicesPrivileges;
@@ -23,7 +22,6 @@ import static org.hamcrest.Matchers.nullValue;
 public class RoleDescriptorRequestValidatorTests extends ESTestCase {
 
     public void testSelectorsValidation() {
-        assumeTrue("failure store feature flag must be enabled", DataStream.isFailureStoreFeatureFlagEnabled());
         String[] invalidIndexNames = {
             "index::failures",
             ".fs-*::failures",

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/permission/LimitedRoleTests.java

@@ -14,7 +14,6 @@ import org.elasticsearch.action.admin.indices.delete.TransportDeleteIndexAction;
 import org.elasticsearch.action.bulk.TransportBulkAction;
 import org.elasticsearch.action.search.TransportSearchAction;
 import org.elasticsearch.cluster.metadata.AliasMetadata;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.cluster.metadata.IndexAbstraction;
 import org.elasticsearch.cluster.metadata.IndexMetadata;
 import org.elasticsearch.cluster.metadata.Metadata;
@@ -648,7 +647,6 @@ public class LimitedRoleTests extends ESTestCase {
     }
 
     public void testAllowedActionsMatcherWithSelectors() {
-        assumeTrue("failure store feature must be enabled", DataStream.isFailureStoreFeatureFlagEnabled());
         Role fromRole = Role.builder(EMPTY_RESTRICTED_INDICES, "fromRole")
             .add(IndexPrivilege.READ_FAILURE_STORE, "ind*")
             .add(IndexPrivilege.READ, "ind*")

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/security/authz/privilege/IndexPrivilegeTests.java

@@ -13,7 +13,6 @@ import org.elasticsearch.action.delete.TransportDeleteAction;
 import org.elasticsearch.action.index.TransportIndexAction;
 import org.elasticsearch.action.search.TransportSearchAction;
 import org.elasticsearch.action.update.TransportUpdateAction;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.common.util.iterable.Iterables;
 import org.elasticsearch.test.ESTestCase;
 import org.elasticsearch.xpack.core.rollup.action.GetRollupIndexCapsAction;
@@ -70,7 +69,6 @@ public class IndexPrivilegeTests extends ESTestCase {
         );
         assertThat(findPrivilegesThatGrant(RefreshAction.NAME), equalTo(List.of("maintenance", "manage", "all")));
 
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         Predicate<IndexPrivilege> failuresOnly = p -> p.getSelectorPredicate() == IndexComponentSelectorPredicate.FAILURES;
         assertThat(findPrivilegesThatGrant(TransportSearchAction.TYPE.name(), failuresOnly), equalTo(List.of("read_failure_store")));
         assertThat(findPrivilegesThatGrant(TransportIndexAction.NAME, failuresOnly), equalTo(List.of()));
@@ -79,7 +77,6 @@ public class IndexPrivilegeTests extends ESTestCase {
         assertThat(findPrivilegesThatGrant(IndicesStatsAction.NAME, failuresOnly), equalTo(List.of("manage_failure_store")));
         assertThat(findPrivilegesThatGrant(RefreshAction.NAME, failuresOnly), equalTo(List.of("manage_failure_store")));
     }
-    }
 
     public void testGet() {
         {
@@ -117,7 +114,6 @@ public class IndexPrivilegeTests extends ESTestCase {
     }
 
     public void testResolveSameSelectorPrivileges() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         {
             IndexPrivilege actual = resolvePrivilegeAndAssertSingleton(Set.of("read_failure_store"));
             assertThat(actual, equalTo(IndexPrivilege.READ_FAILURE_STORE));
@@ -144,7 +140,6 @@ public class IndexPrivilegeTests extends ESTestCase {
     }
 
     public void testResolveBySelectorAccess() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         {
             Set<IndexPrivilege> actual = IndexPrivilege.resolveBySelectorAccess(Set.of("read_failure_store"));
             assertThat(actual, containsInAnyOrder(IndexPrivilege.READ_FAILURE_STORE));

x-pack/plugin/core/src/yamlRestTest/java/org/elasticsearch/license/XPackCoreClientYamlTestSuiteIT.java

@@ -14,7 +14,6 @@ import org.elasticsearch.common.settings.SecureString;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.ThreadContext;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.rest.yaml.ClientYamlTestCandidate;
 import org.elasticsearch.test.rest.yaml.ESClientYamlSuiteTestCase;
 import org.junit.ClassRule;
@@ -25,7 +24,6 @@ public class XPackCoreClientYamlTestSuiteIT extends ESClientYamlSuiteTestCase {
     public static ElasticsearchCluster cluster = ElasticsearchCluster.local()
         .setting("xpack.security.enabled", "true")
         .setting("xpack.license.self_generated.type", "trial")
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .keystore("bootstrap.password", "x-pack-test-password")
         .user("x_pack_rest_user", "x-pack-test-password")
         .systemProperty("es.queryable_built_in_roles_enabled", "false")

x-pack/plugin/esql/src/internalClusterTest/java/org/elasticsearch/xpack/esql/action/EsqlActionIT.java

@@ -22,7 +22,6 @@ import org.elasticsearch.action.index.IndexRequestBuilder;
 import org.elasticsearch.action.support.WriteRequest;
 import org.elasticsearch.client.internal.ClusterAdminClient;
 import org.elasticsearch.cluster.metadata.ComposableIndexTemplate;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.cluster.metadata.DataStreamFailureStore;
 import org.elasticsearch.cluster.metadata.DataStreamOptions;
 import org.elasticsearch.cluster.metadata.IndexMetadata;
@@ -55,7 +54,6 @@ import org.elasticsearch.xpack.esql.core.type.DataType;
 import org.elasticsearch.xpack.esql.parser.ParsingException;
 import org.elasticsearch.xpack.esql.plugin.EsqlPlugin;
 import org.elasticsearch.xpack.esql.plugin.QueryPragmas;
-import org.junit.Assume;
 import org.junit.Before;
 
 import java.io.IOException;
@@ -1027,8 +1025,6 @@ public class EsqlActionIT extends AbstractEsqlIntegTestCase {
     }
 
     public void testDataStreamPatterns() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         Map<String, Long> testCases = new HashMap<>();
         // Concrete data stream with each selector
         testCases.put("test_ds_patterns_1", 5L);
@@ -1087,8 +1083,6 @@ public class EsqlActionIT extends AbstractEsqlIntegTestCase {
     }
 
     public void testDataStreamInvalidPatterns() throws Exception {
-        Assume.assumeTrue(DataStream.isFailureStoreFeatureFlagEnabled());
-
         Map<String, String> testCases = new HashMap<>();
         // === Errors
         // Only recognized components can be selected

x-pack/plugin/esql/src/main/antlr/EsqlBaseParser.g4

@@ -100,7 +100,7 @@ indexPatternAndMetadataFields:
 
 indexPattern
     : (clusterString COLON)? indexString
-    | {this.isDevVersion()}? indexString (CAST_OP selectorString)?
+    | indexString (CAST_OP selectorString)?
     ;
 
 clusterString

x-pack/plugin/esql/src/main/antlr/lexer/From.g4

@@ -18,7 +18,7 @@ FROM_PIPE : PIPE -> type(PIPE), popMode;
 FROM_OPENING_BRACKET : OPENING_BRACKET -> type(OPENING_BRACKET);
 FROM_CLOSING_BRACKET : CLOSING_BRACKET -> type(CLOSING_BRACKET);
 FROM_COLON : COLON -> type(COLON);
-FROM_SELECTOR : {this.isDevVersion()}? CAST_OP -> type(CAST_OP);
+FROM_SELECTOR : CAST_OP -> type(CAST_OP);
 FROM_COMMA : COMMA -> type(COMMA);
 FROM_ASSIGN : ASSIGN -> type(ASSIGN);
 METADATA : 'metadata';

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

@@ -8,7 +8,6 @@
 package org.elasticsearch.xpack.esql.action;
 
 import org.elasticsearch.Build;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.common.util.FeatureFlag;
 import org.elasticsearch.features.NodeFeature;
 import org.elasticsearch.rest.action.admin.cluster.RestNodesCapabilitiesAction;
@@ -948,7 +947,7 @@ public class EsqlCapabilities {
         /**
          * Index component selector syntax (my-data-stream-name::failures)
          */
-        INDEX_COMPONENT_SELECTORS(DataStream.isFailureStoreFeatureFlagEnabled()),
+        INDEX_COMPONENT_SELECTORS,
 
         /**
          * Make numberOfChannels consistent with layout in DefaultLayout by removing duplicated ChannelSet.

x-pack/plugin/security/qa/multi-cluster/src/javaRestTest/java/org/elasticsearch/xpack/remotecluster/RemoteClusterSecurityRCS1FailureStoreRestIT.java

@@ -17,7 +17,6 @@ import org.elasticsearch.core.Nullable;
 import org.elasticsearch.core.Strings;
 import org.elasticsearch.core.Tuple;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.cluster.util.resource.Resource;
 import org.elasticsearch.test.rest.ObjectPath;
@@ -45,7 +44,6 @@ public class RemoteClusterSecurityRCS1FailureStoreRestIT extends AbstractRemoteC
             .name("fulfilling-cluster")
             .nodes(3)
             .apply(commonClusterConfig)
-            .feature(FeatureFlag.FAILURE_STORE_ENABLED)
             .rolesFile(Resource.fromClasspath("roles.yml"))
             .build();
 
@@ -53,7 +51,6 @@ public class RemoteClusterSecurityRCS1FailureStoreRestIT extends AbstractRemoteC
             .distribution(DistributionType.DEFAULT)
             .name("query-cluster")
             .apply(commonClusterConfig)
-            .feature(FeatureFlag.FAILURE_STORE_ENABLED)
             .rolesFile(Resource.fromClasspath("roles.yml"))
             .build();
     }

x-pack/plugin/security/qa/multi-cluster/src/javaRestTest/java/org/elasticsearch/xpack/remotecluster/RemoteClusterSecurityRCS2FailureStoreRestIT.java

@@ -11,7 +11,6 @@ import org.elasticsearch.client.Request;
 import org.elasticsearch.client.ResponseException;
 import org.elasticsearch.core.Tuple;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.cluster.util.resource.Resource;
 import org.junit.ClassRule;
@@ -35,7 +34,6 @@ public class RemoteClusterSecurityRCS2FailureStoreRestIT extends AbstractRemoteC
             .distribution(DistributionType.DEFAULT)
             .name("fulfilling-cluster")
             .apply(commonClusterConfig)
-            .feature(FeatureFlag.FAILURE_STORE_ENABLED)
             .setting("remote_cluster_server.enabled", "true")
             .setting("remote_cluster.port", "0")
             .setting("xpack.security.remote_cluster_server.ssl.enabled", "true")
@@ -49,7 +47,6 @@ public class RemoteClusterSecurityRCS2FailureStoreRestIT extends AbstractRemoteC
             .distribution(DistributionType.DEFAULT)
             .name("query-cluster")
             .apply(commonClusterConfig)
-            .feature(FeatureFlag.FAILURE_STORE_ENABLED)
             .setting("xpack.security.remote_cluster_client.ssl.enabled", "true")
             .setting("xpack.security.remote_cluster_client.ssl.certificate_authorities", "remote-cluster-ca.crt")
             .setting("xpack.security.authc.token.enabled", "true")

x-pack/plugin/security/qa/multi-cluster/src/javaRestTest/java/org/elasticsearch/xpack/remotecluster/RemoteClusterWithoutSecurityFailureStoreRestIT.java

@@ -21,7 +21,6 @@ import org.elasticsearch.core.Tuple;
 import org.elasticsearch.search.SearchHit;
 import org.elasticsearch.search.SearchResponseUtils;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.cluster.local.distribution.DistributionType;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.elasticsearch.test.rest.ObjectPath;
@@ -52,7 +51,6 @@ public class RemoteClusterWithoutSecurityFailureStoreRestIT extends ESRestTestCa
         .distribution(DistributionType.DEFAULT)
         .name("fulfilling-cluster")
         .nodes(3)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .module("analysis-common")
         .setting("xpack.license.self_generated.type", "trial")
         .setting("xpack.security.enabled", "false")
@@ -61,7 +59,6 @@ public class RemoteClusterWithoutSecurityFailureStoreRestIT extends ESRestTestCa
     private static ElasticsearchCluster queryCluster = ElasticsearchCluster.local()
         .distribution(DistributionType.DEFAULT)
         .name("query-cluster")
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .module("analysis-common")
         .setting("xpack.license.self_generated.type", "trial")
         .setting("xpack.security.enabled", "false")

x-pack/plugin/security/qa/operator-privileges-tests/src/javaRestTest/java/org/elasticsearch/xpack/security/operator/Constants.java

@@ -7,8 +7,6 @@
 
 package org.elasticsearch.xpack.security.operator;
 
-import org.elasticsearch.cluster.metadata.DataStream;
-
 import java.util.Objects;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -513,9 +511,9 @@ public class Constants {
         "indices:admin/data_stream/lifecycle/get",
         "indices:admin/data_stream/lifecycle/put",
         "indices:admin/data_stream/lifecycle/explain",
-        DataStream.isFailureStoreFeatureFlagEnabled() ? "indices:admin/data_stream/options/delete" : null,
+        "indices:admin/data_stream/options/delete",
-        DataStream.isFailureStoreFeatureFlagEnabled() ? "indices:admin/data_stream/options/get" : null,
+        "indices:admin/data_stream/options/get",
-        DataStream.isFailureStoreFeatureFlagEnabled() ? "indices:admin/data_stream/options/put" : null,
+        "indices:admin/data_stream/options/put",
         "indices:admin/delete",
         "indices:admin/flush",
         "indices:admin/flush[s]",

x-pack/plugin/security/qa/security-trial/src/javaRestTest/java/org/elasticsearch/xpack/security/failurestore/FailureStoreSecurityRestIT.java

@@ -28,7 +28,6 @@ import org.elasticsearch.search.SearchHit;
 import org.elasticsearch.search.SearchResponseUtils;
 import org.elasticsearch.test.TestSecurityClient;
 import org.elasticsearch.test.cluster.ElasticsearchCluster;
-import org.elasticsearch.test.cluster.FeatureFlag;
 import org.elasticsearch.test.rest.ESRestTestCase;
 import org.elasticsearch.test.rest.ObjectPath;
 import org.elasticsearch.xcontent.XContentBuilder;
@@ -68,7 +67,6 @@ public class FailureStoreSecurityRestIT extends ESRestTestCase {
     @ClassRule
     public static ElasticsearchCluster cluster = ElasticsearchCluster.local()
         .apply(SecurityOnTrialLicenseRestTestCase.commonTrialSecurityClusterConfig)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .build();
 
     @Override

x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/action/user/TransportHasPrivilegesActionTests.java

@@ -9,7 +9,6 @@ package org.elasticsearch.xpack.security.action.user;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.action.support.PlainActionFuture;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.common.bytes.BytesArray;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.util.concurrent.ThreadContext;
@@ -92,8 +91,6 @@ public class TransportHasPrivilegesActionTests extends ESTestCase {
     }
 
     public void testHasPrivilegesRequestDoesNotAllowSelectorsInIndexPatterns() {
-        assumeTrue("failure store required", DataStream.isFailureStoreFeatureFlagEnabled());
-
         final ThreadContext threadContext = new ThreadContext(Settings.EMPTY);
         final SecurityContext context = mock(SecurityContext.class);
         final User user = new User("user-1", "superuser");

x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authz/AuthorizationDenialMessagesTests.java

@@ -8,7 +8,6 @@
 package org.elasticsearch.xpack.security.authz;
 
 import org.elasticsearch.action.search.SearchRequest;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.core.Tuple;
 import org.elasticsearch.test.ESTestCase;
@@ -238,8 +237,6 @@ public class AuthorizationDenialMessagesTests extends ESTestCase {
     }
 
     public void testActionDeniedWithFailuresAndCorrectActionIncludesFailuresMessage() {
-        assumeTrue("failure store required", DataStream.isFailureStoreFeatureFlagEnabled());
-
         Authentication authentication = AuthenticationTestHelper.builder().build();
 
         final String action = "indices:data/read/" + randomAlphaOfLengthBetween(0, 8);
@@ -262,8 +259,6 @@ public class AuthorizationDenialMessagesTests extends ESTestCase {
     }
 
     public void testActionDeniedWithNonMatchingActionFailuresOmitsFailuresMessage() {
-        assumeTrue("failure store required", DataStream.isFailureStoreFeatureFlagEnabled());
-
         Authentication authentication = AuthenticationTestHelper.builder().build();
 
         // granted only by all, so selector message is omitted
@@ -284,8 +279,6 @@ public class AuthorizationDenialMessagesTests extends ESTestCase {
     }
 
     public void testActionDeniedWithoutFailuresOmitsFailuresMessage() {
-        assumeTrue("failure store required", DataStream.isFailureStoreFeatureFlagEnabled());
-
         Authentication authentication = AuthenticationTestHelper.builder().build();
 
         final String action = "indices:data/read/" + randomAlphaOfLengthBetween(0, 8);
@@ -305,8 +298,6 @@ public class AuthorizationDenialMessagesTests extends ESTestCase {
     }
 
     public void testActionDeniedWithoutIndicesOmitsFailuresMessage() {
-        assumeTrue("failure store required", DataStream.isFailureStoreFeatureFlagEnabled());
-
         Authentication authentication = AuthenticationTestHelper.builder().build();
 
         final String action = "indices:data/read/" + randomAlphaOfLengthBetween(0, 8);

x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authz/AuthorizedIndicesTests.java

@@ -312,7 +312,6 @@ public class AuthorizedIndicesTests extends ESTestCase {
     }
 
     public void testDataStreamsAreNotIncludedInAuthorizedIndicesWithFailuresSelectorAndAllPrivilege() {
-        assumeTrue("requires failure store", DataStream.isFailureStoreFeatureFlagEnabled());
         RoleDescriptor aStarRole = new RoleDescriptor(
             "a_star",
             null,
@@ -400,7 +399,6 @@ public class AuthorizedIndicesTests extends ESTestCase {
     }
 
     public void testDataStreamsAreIncludedInAuthorizedIndicesWithFailuresSelectorAndAllPrivilege() {
-        assumeTrue("requires failure store", DataStream.isFailureStoreFeatureFlagEnabled());
         RoleDescriptor aStarRole = new RoleDescriptor(
             "a_star",
             null,
@@ -494,7 +492,6 @@ public class AuthorizedIndicesTests extends ESTestCase {
     }
 
     public void testDataStreamsAreIncludedInAuthorizedIndicesWithFailuresSelector() {
-        assumeTrue("requires failure store", DataStream.isFailureStoreFeatureFlagEnabled());
         RoleDescriptor aReadFailuresStarRole = new RoleDescriptor(
             "a_read_failure_store",
             null,
@@ -577,7 +574,6 @@ public class AuthorizedIndicesTests extends ESTestCase {
     }
 
     public void testDataStreamsAreNotIncludedInAuthorizedIndicesWithFailuresSelector() {
-        assumeTrue("requires failure store", DataStream.isFailureStoreFeatureFlagEnabled());
         RoleDescriptor aReadFailuresStarRole = new RoleDescriptor(
             "a_read_failure_store",
             null,

x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authz/IndicesAndAliasesResolverTests.java

@@ -226,16 +226,12 @@ public class IndicesAndAliasesResolverTests extends ESTestCase {
             .put(indexBuilder(securityIndexName).settings(settings));
 
         // Only add the failure indices if the failure store flag is enabled
-        if (DataStream.isFailureStoreFeatureFlagEnabled()) {
         projectBuilder.put(dataStreamFailureStore1, true).put(dataStreamFailureStore2, true);
-        }
         projectBuilder.put(
             newInstance(
                 dataStreamName,
                 List.of(dataStreamIndex1.getIndex(), dataStreamIndex2.getIndex()),
-                DataStream.isFailureStoreFeatureFlagEnabled()
+                List.of(dataStreamFailureStore1.getIndex(), dataStreamFailureStore2.getIndex())
-                    ? List.of(dataStreamFailureStore1.getIndex(), dataStreamFailureStore2.getIndex())
-                    : List.of()
             )
         );
         if (withAlias) {
@@ -2681,6 +2677,6 @@ public class IndicesAndAliasesResolverTests extends ESTestCase {
     }
 
     private boolean runFailureStore() {
-        return DataStream.isFailureStoreFeatureFlagEnabled() && randomBoolean();
+        return randomBoolean();
     }
 }

x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authz/RBACEngineTests.java

@@ -1416,7 +1416,6 @@ public class RBACEngineTests extends ESTestCase {
     }
 
     public void testBuildUserPrivilegeResponseCombinesIndexPrivileges() {
-        assumeTrue("failure store feature must be enabled", DataStream.isFailureStoreFeatureFlagEnabled());
         final BytesArray query = new BytesArray("""
             {"term":{"public":true}}""");
         final Role role = Role.builder(RESTRICTED_INDICES, "test", "role")

x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authz/accesscontrol/IndicesPermissionTests.java

@@ -187,8 +187,6 @@ public class IndicesPermissionTests extends ESTestCase {
     }
 
     public void testAuthorizeDataStreamAccessWithFailuresSelector() {
-        assumeTrue("failure store required", DataStream.isFailureStoreFeatureFlagEnabled());
-
         Metadata.Builder builder = Metadata.builder();
         String dataStreamName = randomAlphaOfLength(6);
         int numBackingIndices = randomIntBetween(1, 3);
@@ -367,7 +365,6 @@ public class IndicesPermissionTests extends ESTestCase {
     }
 
     public void testAuthorizeDataStreamFailureIndices() {
-        assumeTrue("failure store required", DataStream.isFailureStoreFeatureFlagEnabled());
         Metadata.Builder builder = Metadata.builder();
         String dataStreamName = randomAlphaOfLength(6);
         int numBackingIndices = randomIntBetween(1, 3);

x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authz/store/CompositeRolesStoreTests.java

@@ -23,7 +23,6 @@ import org.elasticsearch.action.search.TransportSearchAction;
 import org.elasticsearch.action.support.PlainActionFuture;
 import org.elasticsearch.client.internal.Client;
 import org.elasticsearch.cluster.health.ClusterHealthStatus;
-import org.elasticsearch.cluster.metadata.DataStream;
 import org.elasticsearch.cluster.metadata.IndexAbstraction;
 import org.elasticsearch.cluster.metadata.IndexMetadata;
 import org.elasticsearch.cluster.metadata.Metadata;
@@ -1548,7 +1547,6 @@ public class CompositeRolesStoreTests extends ESTestCase {
     }
 
     public void testBuildRoleWithReadFailureStorePrivilegeOnly() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         String indexPattern = randomAlphanumericOfLength(10);
         boolean allowRestrictedIndices = randomBoolean();
         final Role role = buildRole(
@@ -1566,7 +1564,6 @@ public class CompositeRolesStoreTests extends ESTestCase {
     }
 
     public void testBuildRoleWithReadFailureStorePrivilegeDuplicatesMerged() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         String indexPattern = randomAlphanumericOfLength(10);
         boolean allowRestrictedIndices = randomBoolean();
         final List<Role> roles = List.of(
@@ -1614,7 +1611,6 @@ public class CompositeRolesStoreTests extends ESTestCase {
     }
 
     public void testBuildRoleWithReadFailureStoreAndReadPrivilegeSplit() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         String indexPattern = randomAlphanumericOfLength(10);
         boolean allowRestrictedIndices = randomBoolean();
         final Role role = buildRole(
@@ -1636,7 +1632,6 @@ public class CompositeRolesStoreTests extends ESTestCase {
     }
 
     public void testBuildRoleWithReadFailureStoreAndReadPrivilegeAndMultipleIndexPatternsSplit() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         String indexPattern = randomAlphanumericOfLength(10);
         String otherIndexPattern = randomValueOtherThan(indexPattern, () -> randomAlphanumericOfLength(10));
         boolean allowRestrictedIndices = randomBoolean();
@@ -1694,7 +1689,6 @@ public class CompositeRolesStoreTests extends ESTestCase {
     }
 
     public void testBuildRoleWithReadOnRestrictedAndNonRestrictedIndices() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         String indexPattern = randomAlphanumericOfLength(10);
         List<Role> roles = List.of(
             buildRole(
@@ -1739,7 +1733,6 @@ public class CompositeRolesStoreTests extends ESTestCase {
     }
 
     public void testBuildRoleWithReadFailureStoreOnRestrictedAndNonRestrictedIndices() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         String indexPattern = randomAlphanumericOfLength(10);
         List<Role> roles = List.of(
             buildRole(
@@ -1792,7 +1785,6 @@ public class CompositeRolesStoreTests extends ESTestCase {
     }
 
     public void testBuildRoleWithMultipleReadFailureStoreAndReadPrivilegeSplit() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         String indexPattern = randomAlphanumericOfLength(10);
         boolean allowRestrictedIndices = randomBoolean();
         final List<Role> roles = List.of(
@@ -1844,7 +1836,6 @@ public class CompositeRolesStoreTests extends ESTestCase {
     }
 
     public void testBuildRoleWithAllPrivilegeIsNeverSplit() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         String indexPattern = randomAlphanumericOfLength(10);
         boolean allowRestrictedIndices = randomBoolean();
         final List<Role> roles = List.of(
@@ -1899,7 +1890,6 @@ public class CompositeRolesStoreTests extends ESTestCase {
     }
 
     public void testBuildRoleWithFailureStorePrivilegeCollatesToRemoveDlsFlsFromAnotherGroup() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         String indexPattern = randomAlphanumericOfLength(10);
         boolean allowRestrictedIndices = randomBoolean();
         final List<Role> roles = List.of(
@@ -1977,7 +1967,6 @@ public class CompositeRolesStoreTests extends ESTestCase {
     }
 
     public void testBuildRoleWithFailureStorePrivilegeCollatesToKeepDlsFlsFromAnotherGroup() {
-        assumeTrue("requires failure store feature", DataStream.isFailureStoreFeatureFlagEnabled());
         String indexPattern = randomAlphanumericOfLength(10);
         boolean allowRestrictedIndices = randomBoolean();
         final Role role = buildRole(
@@ -2025,17 +2014,11 @@ public class CompositeRolesStoreTests extends ESTestCase {
 
     public void testBuildRoleDoesNotSplitIfAllPrivilegesHaveTheSameSelector() {
         String indexPattern = randomAlphanumericOfLength(10);
-        IndexComponentSelectorPredicate predicate = (DataStream.isFailureStoreFeatureFlagEnabled())
+        IndexComponentSelectorPredicate predicate = randomFrom(
-            ? randomFrom(
             IndexComponentSelectorPredicate.ALL,
             IndexComponentSelectorPredicate.DATA,
             IndexComponentSelectorPredicate.FAILURES,
             IndexComponentSelectorPredicate.DATA_AND_FAILURES
-            )
-            : randomFrom(
-                IndexComponentSelectorPredicate.ALL,
-                IndexComponentSelectorPredicate.DATA,
-                IndexComponentSelectorPredicate.DATA_AND_FAILURES
         );
 
         List<String> privilegesWithSelector = IndexPrivilege.names()

x-pack/plugin/shutdown/qa/full-cluster-restart/src/javaRestTest/java/org/elasticsearch/xpack/restart/FullClusterRestartIT.java

@@ -62,7 +62,6 @@ public class FullClusterRestartIT extends ParameterizedFullClusterRestartTestCas
         .keystore("xpack.watcher.encryption_key", Resource.fromClasspath("system_key"))
         .keystore("xpack.security.transport.ssl.secure_key_passphrase", "testnode")
         .feature(FeatureFlag.TIME_SERIES_MODE)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .build();
 
     public FullClusterRestartIT(@Name("cluster") FullClusterRestartUpgradeStatus upgradeStatus) {

x-pack/qa/full-cluster-restart/src/javaRestTest/java/org/elasticsearch/xpack/restart/AbstractXpackFullClusterRestartTestCase.java

@@ -37,7 +37,6 @@ public abstract class AbstractXpackFullClusterRestartTestCase extends Parameteri
         .keystore("xpack.watcher.encryption_key", Resource.fromClasspath("system_key"))
         .keystore("xpack.security.transport.ssl.secure_key_passphrase", "testnode")
         .feature(FeatureFlag.TIME_SERIES_MODE)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .build();
 
     public AbstractXpackFullClusterRestartTestCase(FullClusterRestartUpgradeStatus upgradeStatus) {

x-pack/qa/multi-project/core-rest-tests-with-multiple-projects/src/yamlRestTest/java/org/elasticsearch/multiproject/test/CoreWithMultipleProjectsClientYamlTestSuiteIT.java

@@ -46,7 +46,6 @@ public class CoreWithMultipleProjectsClientYamlTestSuiteIT extends MultipleProje
         .user(USER, PASS)
         .systemProperty("es.queryable_built_in_roles_enabled", "false")
         .feature(FeatureFlag.TIME_SERIES_MODE)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .nodes(2)
         .build();
 

x-pack/qa/multi-project/xpack-rest-tests-with-multiple-projects/src/yamlRestTest/java/org/elasticsearch/multiproject/test/XpackWithMultipleProjectsClientYamlTestSuiteIT.java

@@ -44,7 +44,6 @@ public class XpackWithMultipleProjectsClientYamlTestSuiteIT extends MultipleProj
         .configFile("service_tokens", Resource.fromClasspath("service_tokens"))
         .user(USER, PASS)
         .feature(FeatureFlag.TIME_SERIES_MODE)
-        .feature(FeatureFlag.FAILURE_STORE_ENABLED)
         .build();
 
     public XpackWithMultipleProjectsClientYamlTestSuiteIT(@Name("yaml") ClientYamlTestCandidate testCandidate) {