Add downgrade logic for branch in DocLinkService

CHANGELOG.md

@@ -200,6 +200,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Add path ignore for markdown files for CI ([#2312](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2312))
 - Updating WS scans to ignore BWC artifacts in `cypress` ([#2408](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2408))
 - [CI] Run functional test repo as workflow ([#2503](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/2503))
+- [CI] Patch pkg.branch according to pkg.version when build ([#3483](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/3483))
 
 ### 📝 Documentation
 

src/dev/build/tasks/create_package_json_task.ts

@@ -29,6 +29,7 @@
  */
 
 import { copyWorkspacePackages } from '@osd/pm';
+import { parse } from 'semver';
 
 import { read, write, Task } from '../lib';
 
@@ -37,14 +38,24 @@ export const CreatePackageJson: Task = {
 
   async run(config, log, build) {
     const pkg = config.getOpenSearchDashboardsPkg();
+    /**
+     * OpenSearch server has a logic that if the pkg.branch is "main",
+     * set the docVersion to latest. So here we exclude main.
+     */
+    const semverResult = parse(config.getBuildVersion());
+    const shouldPatch = semverResult && pkg.branch !== 'main';
+    const branch = shouldPatch ? `${semverResult.major}.${semverResult.minor}` : pkg.branch;
+    if (shouldPatch) {
+      log.info(`Patch branch property: ${branch}`);
+    }
 
     const newPkg = {
       name: pkg.name,
       private: true,
       description: pkg.description,
       keywords: pkg.keywords,
       version: config.getBuildVersion(),
-      branch: pkg.branch,
+      branch,
       build: {
         number: config.getBuildNumber(),
         sha: config.getBuildSha(),