Remove version 8.15.6

Author: mark-vieira

.buildkite/pipelines/intake.yml

@@ -56,7 +56,7 @@ steps:
         timeout_in_minutes: 300
         matrix:
           setup:
-            BWC_VERSION: ["7.17.27", "8.15.6", "8.16.2"]
+            BWC_VERSION: ["7.17.27", "8.16.2"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2004

.buildkite/pipelines/periodic-packaging.yml

@@ -559,8 +559,8 @@ steps:
         env:
           BWC_VERSION: 8.14.3
 
-      - label: "{{matrix.image}} / 8.15.6 / packaging-tests-upgrade"
-        command: ./.ci/scripts/packaging-test.sh -Dbwc.checkout.align=true destructiveDistroUpgradeTest.v8.15.6
+      - label: "{{matrix.image}} / 8.15.5 / packaging-tests-upgrade"
+        command: ./.ci/scripts/packaging-test.sh -Dbwc.checkout.align=true destructiveDistroUpgradeTest.v8.15.5
         timeout_in_minutes: 300
         matrix:
           setup:
@@ -573,7 +573,7 @@ steps:
           machineType: custom-16-32768
           buildDirectory: /dev/shm/bk
         env:
-          BWC_VERSION: 8.15.6
+          BWC_VERSION: 8.15.5
 
       - label: "{{matrix.image}} / 8.16.2 / packaging-tests-upgrade"
         command: ./.ci/scripts/packaging-test.sh -Dbwc.checkout.align=true destructiveDistroUpgradeTest.v8.16.2

.buildkite/pipelines/periodic.yml

@@ -629,8 +629,8 @@ steps:
             - signal_reason: agent_stop
               limit: 3
 
-      - label: 8.15.6 / bwc
-        command: .ci/scripts/run-gradle.sh -Dbwc.checkout.align=true v8.15.6#bwcTest
+      - label: 8.15.5 / bwc
+        command: .ci/scripts/run-gradle.sh -Dbwc.checkout.align=true v8.15.5#bwcTest
         timeout_in_minutes: 300
         agents:
           provider: gcp
@@ -639,7 +639,7 @@ steps:
           buildDirectory: /dev/shm/bk
           preemptible: true
         env:
-          BWC_VERSION: 8.15.6
+          BWC_VERSION: 8.15.5
         retry:
           automatic:
             - exit_status: "-1"
@@ -733,7 +733,7 @@ steps:
           setup:
             ES_RUNTIME_JAVA:
               - openjdk17
-            BWC_VERSION: ["7.17.27", "8.15.6", "8.16.2"]
+            BWC_VERSION: ["7.17.27", "8.16.2"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2004
@@ -781,7 +781,7 @@ steps:
               - openjdk21
               - openjdk22
               - openjdk23
-            BWC_VERSION: ["7.17.27", "8.15.6", "8.16.2"]
+            BWC_VERSION: ["7.17.27", "8.16.2"]
         agents:
           provider: gcp
           image: family/elasticsearch-ubuntu-2004

.ci/bwcVersions

@@ -32,5 +32,5 @@ BWC_VERSION:
   - "8.12.2"
   - "8.13.4"
   - "8.14.3"
-  - "8.15.6"
+  - "8.15.5"
   - "8.16.2"

.ci/snapshotBwcVersions

@@ -1,4 +1,3 @@
 BWC_VERSION:
   - "7.17.27"
-  - "8.15.6"
   - "8.16.2"

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

@@ -190,7 +190,6 @@ public class Version implements VersionId<Version>, ToXContentFragment {
     public static final Version V_8_15_3 = new Version(8_15_03_99);
     public static final Version V_8_15_4 = new Version(8_15_04_99);
     public static final Version V_8_15_5 = new Version(8_15_05_99);
-    public static final Version V_8_15_6 = new Version(8_15_06_99);
     public static final Version V_8_16_0 = new Version(8_16_00_99);
     public static final Version V_8_16_1 = new Version(8_16_01_99);
     public static final Version V_8_16_2 = new Version(8_16_02_99);