Reduce parallelism for scraping and indexing non-English languages (#44985)

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

@@ -105,7 +105,7 @@ jobs:
       # the whole job fast.
       # As of June 2023, it takes about 10+ minutes to index one whole
       # language and we have 8 non-English languages.
-      max-parallel: 3
+      max-parallel: 2
       matrix:
         language: ${{ fromJSON(needs.figureOutMatrix.outputs.matrix) }}
     steps: