Bump 8.x to 8.18.0

Author: elasticsearchmachine

.backportrc.json

@@ -1,10 +1,10 @@
 {
   "upstream" : "elastic/elasticsearch",
-  "targetBranchChoices" : [ "main", "8.x", "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", "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$" : "main",
-    "^v8.17.0$" : "8.x",
+    "^v8.18.0$" : "8.x",
     "^v(\\d+).(\\d+).\\d+(?:-(?:alpha|beta|rc)\\d+)?$" : "$1.$2"
   }
 }

.buildkite/pipelines/intake.yml

@@ -56,7 +56,7 @@ steps:
         timeout_in_minutes: 300
         matrix:
           setup:
-            BWC_VERSION: ["8.16.1", "8.17.0", "9.0.0"]
+            BWC_VERSION: ["8.16.1", "8.17.0", "8.18.0", "9.0.0"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2004

.buildkite/pipelines/periodic-packaging.yml

@@ -320,6 +320,22 @@ steps:
         env:
           BWC_VERSION: 8.17.0
 
+      - label: "{{matrix.image}} / 8.18.0 / packaging-tests-upgrade"
+        command: ./.ci/scripts/packaging-test.sh -Dbwc.checkout.align=true destructiveDistroUpgradeTest.v8.18.0
+        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: 8.18.0
+
       - label: "{{matrix.image}} / 9.0.0 / packaging-tests-upgrade"
         command: ./.ci/scripts/packaging-test.sh -Dbwc.checkout.align=true destructiveDistroUpgradeTest.v9.0.0
         timeout_in_minutes: 300

.buildkite/pipelines/periodic.yml

@@ -344,6 +344,25 @@ steps:
             - signal_reason: agent_stop
               limit: 3
 
+      - label: 8.18.0 / bwc
+        command: .ci/scripts/run-gradle.sh -Dbwc.checkout.align=true v8.18.0#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: 8.18.0
+        retry:
+          automatic:
+            - exit_status: "-1"
+              limit: 3
+              signal_reason: none
+            - signal_reason: agent_stop
+              limit: 3
+
       - label: 9.0.0 / bwc
         command: .ci/scripts/run-gradle.sh -Dbwc.checkout.align=true v9.0.0#bwcTest
         timeout_in_minutes: 300
@@ -429,7 +448,7 @@ steps:
           setup:
             ES_RUNTIME_JAVA:
               - openjdk21
-            BWC_VERSION: ["8.16.1", "8.17.0", "9.0.0"]
+            BWC_VERSION: ["8.16.1", "8.17.0", "8.18.0", "9.0.0"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2004
@@ -471,7 +490,7 @@ steps:
             ES_RUNTIME_JAVA:
               - openjdk21
               - openjdk23
-            BWC_VERSION: ["8.16.1", "8.17.0", "9.0.0"]
+            BWC_VERSION: ["8.16.1", "8.17.0", "8.18.0", "9.0.0"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2004

.ci/bwcVersions

@@ -17,4 +17,5 @@ BWC_VERSION:
   - "8.15.4"
   - "8.16.1"
   - "8.17.0"
+  - "8.18.0"
   - "9.0.0"

.ci/snapshotBwcVersions

@@ -1,4 +1,5 @@
 BWC_VERSION:
   - "8.16.1"
   - "8.17.0"
+  - "8.18.0"
   - "9.0.0"

docs/reference/migration/migrate_8_18.asciidoc

@@ -0,0 +1,20 @@
+[[migrating-8.18]]
+== Migrating to 8.18
+++++
+<titleabbrev>8.18</titleabbrev>
+++++
+
+This section discusses the changes that you need to be aware of when migrating
+your application to {es} 8.18.
+
+See also <<release-highlights>> and <<es-release-notes>>.
+
+coming::[8.18.0]
+
+
+[discrete]
+[[breaking-changes-8.18]]
+=== Breaking changes
+
+There are no breaking changes in {es} 8.18.
+