workflow_dispatch version input for sync search (#32207)

.github/workflows/sync-search-elasticsearch.yml

@@ -7,6 +7,11 @@ name: Sync search Elasticsearch
 
 on:
   workflow_dispatch:
+    inputs:
+      version:
+        description: "Version to exclusively generate the search index for. E.g. 'dotcom', 'ghes-3.7', 'ghae'"
+        required: false
+        default: ''
   schedule:
     - cron: '23 */4 * * *' # Run every 4 hours at 23 minutes past the hour
 
@@ -88,6 +93,10 @@ jobs:
           # let's just accept an empty string instead.
           THROW_ON_EMPTY: false
 
+          # Note that by default, this is '' (empty string) and that means
+          # the same as not set within the script.
+          VERSION: ${{ github.event.inputs.version }}
+
         run: |
           mkdir /tmp/records
           npm run sync-search-indices -- \
@@ -102,6 +111,11 @@ jobs:
           curl --fail --retry-connrefused --retry 5 -I ${{ env.ELASTICSEARCH_URL }}
 
       - name: Index into Elasticsearch
+        env:
+          # Must match what we used when scraping (npm run sync-search-indices)
+          # otherwise the script will seek other versions from disk that might
+          # not exist.
+          VERSION: ${{ github.event.inputs.version }}
         run: |
           ./script/search/index-elasticsearch.js \
             --language ${{ matrix.language }} -- /tmp/records