chore(NA): prepare replacement of 8.x branch with 8.19 (#218514)

This PR prepares the changes needed for removing 8.x branch and create
8.19.

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

.backportrc.json

@@ -4,7 +4,7 @@
   "targetBranchChoices": [
     "main",
     "9.0",
-    "8.x",
+    "8.19",
     "8.18",
     "8.17",
     "8.16",
@@ -58,7 +58,6 @@
   ],
   "branchLabelMapping": {
     "^v9.1.0$": "main",
-    "^v8.19.0$": "8.x",
     "^v(\\d+).(\\d+).\\d+$": "$1.$2"
   },
   "autoMerge": true,

.buildkite/pipeline-resource-definitions/kibana-console-definitions-sync.yml

@@ -22,7 +22,7 @@ spec:
         SLACK_NOTIFICATIONS_CHANNEL: '#kibana-management'
         ELASTIC_SLACK_NOTIFICATIONS_ENABLED: 'true'
       allow_rebuilds: false
-      branch_configuration: main 8.x
+      branch_configuration: main 8.19
       default_branch: main
       repository: elastic/kibana
       pipeline_file: .buildkite/pipelines/console_definitions_sync.yml

.buildkite/pipeline-resource-definitions/kibana-es-forward-testing-9-dot-0.yml

@@ -3,7 +3,7 @@ apiVersion: backstage.io/v1alpha1
 kind: Resource
 metadata:
   name: bk-kibana-es-forward-compatibility-testing-9-dot-0
-  description: Forward compatibility testing between Kibana 8.18 and ES 9+
+  description: Forward compatibility testing between Kibana 8.19 and ES 9+
   links:
     - url: 'https://buildkite.com/elastic/kibana-es-forward-compatibility-testing-9-dot-0'
       title: Pipeline link
@@ -16,7 +16,7 @@ spec:
     kind: Pipeline
     metadata:
       name: kibana / ES Forward Compatibility Testing 9.0
-      description: Forward compatibility testing between Kibana 8.18 and ES 9+
+      description: Forward compatibility testing between Kibana 8.19 and ES 9+
     spec:
       env:
         SLACK_NOTIFICATIONS_CHANNEL: '#kibana-operations-alerts'
@@ -26,7 +26,7 @@ spec:
       branch_configuration: main
       default_branch: main
       repository: elastic/kibana
-      pipeline_file: .buildkite/pipelines/es_forward_9_dot_0.yml # Note: this file exists in 8.x only and should be moved into 8.18 once the branch is cut
+      pipeline_file: .buildkite/pipelines/es_forward_9_dot_0.yml
       skip_intermediate_builds: false
       provider_settings:
         prefix_pull_request_fork_branch_names: false

.buildkite/pipeline-resource-definitions/kibana-es-snapshots.yml

@@ -22,7 +22,7 @@ spec:
         SLACK_NOTIFICATIONS_CHANNEL: '#kibana-operations-alerts'
         ELASTIC_SLACK_NOTIFICATIONS_ENABLED: 'true'
       allow_rebuilds: true
-      branch_configuration: main 9.0 8.x 8.18 8.17 7.17
+      branch_configuration: main 9.0 8.19 8.18 8.17 8.16 7.17
       default_branch: main
       repository: elastic/kibana
       pipeline_file: .buildkite/pipelines/es_snapshots/build.yml
@@ -52,10 +52,10 @@ spec:
           cronline: 0 22 * * * America/New_York
           message: Daily build
           branch: '9.0'
-        Daily build (8.x):
+        Daily build (8.19):
           cronline: 0 22 * * * America/New_York
           message: Daily build
-          branch: '8.x'
+          branch: '8.19'
         Daily build (8.18):
           cronline: 0 22 * * * America/New_York
           message: Daily build
@@ -95,7 +95,7 @@ spec:
         SLACK_NOTIFICATIONS_CHANNEL: '#kibana-operations-alerts'
         ELASTIC_SLACK_NOTIFICATIONS_ENABLED: 'true'
       allow_rebuilds: true
-      branch_configuration: main 9.0 8.x 8.18 8.17 7.17
+      branch_configuration: main 9.0 8.19 8.18 8.17 8.16 7.17
       default_branch: main
       repository: elastic/kibana
       pipeline_file: .buildkite/pipelines/es_snapshots/promote.yml
@@ -144,7 +144,7 @@ spec:
         ELASTIC_SLACK_NOTIFICATIONS_ENABLED: 'true'
         REPORT_FAILED_TESTS_TO_GITHUB: 'true'
       allow_rebuilds: true
-      branch_configuration: main 9.0 8.x 8.18 8.17 7.17
+      branch_configuration: main 9.0 8.19 8.18 8.17 8.16 7.17
       default_branch: main
       repository: elastic/kibana
       pipeline_file: .buildkite/pipelines/es_snapshots/verify.yml

.buildkite/pipeline-resource-definitions/kibana-on-merge-unsupported-ftrs.yml

@@ -23,7 +23,7 @@ spec:
         ELASTIC_SLACK_NOTIFICATIONS_ENABLED: 'true'
         SCOUT_REPORTER_ENABLED: 'true'
       allow_rebuilds: true
-      branch_configuration: main 9.0 8.x 8.18 8.17 7.17
+      branch_configuration: main 9.0 8.19 8.18 8.17 8.16 7.17
       default_branch: main
       repository: elastic/kibana
       pipeline_file: .buildkite/pipelines/on_merge_unsupported_ftrs.yml

.buildkite/pipeline-resource-definitions/kibana-on-merge.yml

@@ -26,7 +26,7 @@ spec:
         ELASTIC_SLACK_NOTIFICATIONS_ENABLED: 'true'
         SCOUT_REPORTER_ENABLED: 'true'
       allow_rebuilds: true
-      branch_configuration: main 9.0 8.x 8.18 8.17 7.17
+      branch_configuration: main 9.0 8.19 8.18 8.17 8.16 7.17
       default_branch: main
       repository: elastic/kibana
       pipeline_file: .buildkite/pipelines/on_merge.yml

.buildkite/scripts/pipelines/trigger_version_dependent_jobs/pipeline.ts

@@ -97,15 +97,13 @@ export function getESForwardPipelineTriggers(): BuildkiteTriggerStep[] {
 
 /**
  * This pipeline is testing the forward compatibility of Kibana with different versions of Elasticsearch for 9.0.
- * Should be triggered for combinations of (Kibana@8.18 + ES@9.x {current open branches on the same major})
+ * Should be triggered for combinations of (Kibana@8.19 + ES@9.x {current open branches on the same major})
  */
 export function getESForward9Dot0PipelineTriggers(): BuildkiteTriggerStep[] {
   const versions = getVersionsFile();
-  const KIBANA_8_X = versions.versions.find((v) => v.branch === '8.x');
+  const KIBANA_8_19 = versions.versions.find((v) => v.branch === '8.19');
-  if (!KIBANA_8_X) {
+  if (!KIBANA_8_19) {
-    throw new Error(
+    throw new Error('Update ES forward compatibility 9.0 pipeline to 8.19');
-      'Update ES forward compatibility 9.0 pipeline to remove 8.x and add version 8.18'
-    );
   }
   const targetESVersions = versions.versions.filter(
     (v) => v.branch.startsWith('9.') || (v.branch.includes('main') && v.version.startsWith('9.0.0'))
@@ -115,10 +113,10 @@ export function getESForward9Dot0PipelineTriggers(): BuildkiteTriggerStep[] {
     return {
       trigger: pipelineSets['es-forward-9-dot-0'],
       async: true,
-      label: `Triggering Kibana ${KIBANA_8_X.version} + ES ${version} forward compatibility`,
+      label: `Triggering Kibana ${KIBANA_8_19.version} + ES ${version} forward compatibility`,
       build: {
         message: process.env.MESSAGE || `ES forward-compatibility test for ES ${version}`,
-        branch: KIBANA_8_X.branch,
+        branch: KIBANA_8_19.branch,
         commit: 'HEAD',
         env: {
           ES_SNAPSHOT_MANIFEST: `https://storage.googleapis.com/kibana-ci-es-snapshots-daily/${version}/manifest-latest-verified.json`,

.buildkite/scripts/steps/openapi_publishing/publish_oas_docs.sh

@@ -46,11 +46,11 @@ if [[ "$BUILDKITE_BRANCH" == "main" ]]; then
   exit 0;
 fi
 
-if [[ "$BUILDKITE_BRANCH" == "8.x" ]]; then
+if [[ "$BUILDKITE_BRANCH" == "8.19" ]]; then
   BUMP_KIBANA_DOC_NAME="$(vault_get kibana-bump-sh kibana-doc-name)"
   BUMP_KIBANA_DOC_TOKEN="$(vault_get kibana-bump-sh kibana-token)"
-  deploy_to_bump "$(pwd)/oas_docs/output/kibana.yaml" $BUMP_KIBANA_DOC_NAME $BUMP_KIBANA_DOC_TOKEN 8x-unreleased;
+  deploy_to_bump "$(pwd)/oas_docs/output/kibana.yaml" $BUMP_KIBANA_DOC_NAME $BUMP_KIBANA_DOC_TOKEN 8dot19;
   exit 0;
 fi
 
-echo "No branches found to push to; stopping here."
+echo "No branches found to push to; stopping here."

versions.json

@@ -15,7 +15,7 @@
     },
     {
       "version": "8.19.0",
-      "branch": "8.x",
+      "branch": "8.19",
       "previousMajor": true
     },
     {