Bump to version 9.1.0

.backportrc.json

@@ -1,10 +1,10 @@
 {
   "upstream" : "elastic/elasticsearch",
-  "targetBranchChoices" : [ "main", "8.x", "8.18", "8.17", "8.16", "8.15", "8.14", "8.13", "8.12", "8.11", "8.10", "8.9", "8.8", "8.7", "8.6", "8.5", "8.4", "8.3", "8.2", "8.1", "8.0", "7.17", "6.8" ],
+  "targetBranchChoices" : [ "main", "8.x", "9.0", "8.18", "8.17", "8.16", "8.15", "8.14", "8.13", "8.12", "8.11", "8.10", "8.9", "8.8", "8.7", "8.6", "8.5", "8.4", "8.3", "8.2", "8.1", "8.0", "7.17", "6.8" ],
   "targetPRLabels" : [ "backport" ],
   "branchLabelMapping" : {
-    "^v9.0.0$" : "main",
+    "^v9.1.0$" : "main",
     "^v8.19.0$" : "8.x",
     "^v(\\d+).(\\d+).\\d+(?:-(?:alpha|beta|rc)\\d+)?$" : "$1.$2"
   }
-}
+}

.buildkite/pipelines/intake.yml

@@ -56,7 +56,7 @@ steps:
         timeout_in_minutes: 300
         matrix:
           setup:
-            BWC_VERSION: ["8.16.4", "8.17.2", "8.18.0", "9.0.0"]
+            BWC_VERSION: ["8.16.4", "8.17.2", "8.18.0", "8.19.0", "9.0.0", "9.1.0"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2004

.buildkite/pipelines/periodic-packaging.yml

@@ -367,6 +367,22 @@ steps:
         env:
           BWC_VERSION: 9.0.0
 
+      - label: "{{matrix.image}} / 9.1.0 / packaging-tests-upgrade"
+        command: ./.ci/scripts/packaging-test.sh -Dbwc.checkout.align=true destructiveDistroUpgradeTest.v9.1.0
+        timeout_in_minutes: 300
+        matrix:
+          setup:
+            image:
+              - rocky-8
+              - ubuntu-2004
+        agents:
+          provider: gcp
+          image: family/elasticsearch-{{matrix.image}}
+          machineType: custom-16-32768
+          buildDirectory: /dev/shm/bk
+        env:
+          BWC_VERSION: 9.1.0
+
   - group: packaging-tests-windows
     steps:
       - label: "{{matrix.image}} / packaging-tests-windows"

.buildkite/pipelines/periodic.yml

@@ -401,6 +401,25 @@ steps:
             - signal_reason: agent_stop
               limit: 3
 
+      - label: 9.1.0 / bwc
+        command: .ci/scripts/run-gradle.sh -Dbwc.checkout.align=true v9.1.0#bwcTest
+        timeout_in_minutes: 300
+        agents:
+          provider: gcp
+          image: family/elasticsearch-ubuntu-2004
+          machineType: n1-standard-32
+          buildDirectory: /dev/shm/bk
+          preemptible: true
+        env:
+          BWC_VERSION: 9.1.0
+        retry:
+          automatic:
+            - exit_status: "-1"
+              limit: 3
+              signal_reason: none
+            - signal_reason: agent_stop
+              limit: 3
+
   - label: concurrent-search-tests
     command: .ci/scripts/run-gradle.sh -Dbwc.checkout.align=true -Dtests.jvm.argline=-Des.concurrent_search=true -Des.concurrent_search=true functionalTests
     timeout_in_minutes: 420
@@ -467,7 +486,7 @@ steps:
           setup:
             ES_RUNTIME_JAVA:
               - openjdk21
-            BWC_VERSION: ["8.16.4", "8.17.2", "8.18.0", "9.0.0"]
+            BWC_VERSION: ["8.16.4", "8.17.2", "8.18.0", "8.19.0", "9.0.0", "9.1.0"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2004
@@ -509,7 +528,7 @@ steps:
             ES_RUNTIME_JAVA:
               - openjdk21
               - openjdk23
-            BWC_VERSION: ["8.16.4", "8.17.2", "8.18.0", "9.0.0"]
+            BWC_VERSION: ["8.16.4", "8.17.2", "8.18.0", "8.19.0", "9.0.0", "9.1.0"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2004

.ci/bwcVersions

@@ -20,3 +20,4 @@ BWC_VERSION:
   - "8.18.0"
   - "8.19.0"
   - "9.0.0"
+  - "9.1.0"

.ci/snapshotBwcVersions

@@ -2,4 +2,6 @@ BWC_VERSION:
   - "8.16.4"
   - "8.17.2"
   - "8.18.0"
+  - "8.19.0"
   - "9.0.0"
+  - "9.1.0"

build-tools-internal/version.properties

@@ -1,4 +1,4 @@
-elasticsearch     = 9.0.0
+elasticsearch     = 9.1.0
 lucene            = 10.1.0
 
 bundled_jdk_vendor = openjdk

docs/reference/migration/index.asciidoc

@@ -1,6 +1,8 @@
 include::migration_intro.asciidoc[]
 
+* <<migrating-9.1,Migrating to 9.1>>
 * <<migrating-9.0,Migrating to 9.0>>
 
+include::migrate_9_1.asciidoc[]
 include::migrate_9_0.asciidoc[]
 

docs/reference/migration/migrate_9_1.asciidoc

@@ -0,0 +1,20 @@
+[[migrating-9.1]]
+== Migrating to 9.1
+++++
+<titleabbrev>9.1</titleabbrev>
+++++
+
+This section discusses the changes that you need to be aware of when migrating
+your application to {es} 9.1.
+
+See also <<release-highlights>> and <<es-release-notes>>.
+
+coming::[9.1.0]
+
+
+[discrete]
+[[breaking-changes-9.1]]
+=== Breaking changes
+
+There are no breaking changes in {es} 9.1.
+

docs/reference/release-notes.asciidoc

@@ -6,9 +6,11 @@
 
 This section summarizes the changes in each release.
 
+* <<release-notes-9.1.0>>
 * <<release-notes-9.0.0>>
 
 --
 
+include::release-notes/9.1.0.asciidoc[]
 include::release-notes/9.0.0.asciidoc[]
 

docs/reference/release-notes/9.1.0.asciidoc

@@ -0,0 +1,8 @@
+[[release-notes-9.1.0]]
+== {es} version 9.1.0
+
+coming[9.1.0]
+
+Also see <<breaking-changes-9.1,Breaking changes in 9.1>>.
+
+

docs/reference/release-notes/highlights.asciidoc

@@ -8,6 +8,11 @@ ifeval::["{release-state}"!="unreleased"]
 For detailed information about this release, see the <<es-release-notes>> and
 <<breaking-changes>>.
 
+// Add previous release to the list
+Other versions:
+
+{ref-bare}/9.0/release-highlights.html[9.0]
+
 endif::[]
 
 // The notable-highlights tag marks entries that

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

@@ -199,7 +199,8 @@ public class Version implements VersionId<Version>, ToXContentFragment {
     public static final Version V_8_18_0 = new Version(8_18_00_99);
     public static final Version V_8_19_0 = new Version(8_19_00_99);
     public static final Version V_9_0_0 = new Version(9_00_00_99);
-    public static final Version CURRENT = V_9_0_0;
+    public static final Version V_9_1_0 = new Version(9_01_00_99);
+    public static final Version CURRENT = V_9_1_0;
 
     private static final NavigableMap<Integer, Version> VERSION_IDS;
     private static final Map<String, Version> VERSION_STRINGS;