[8.16] Prevent work starvation bug if using scaling EsThreadPoolExecutor with core pool size = 0 (#124732)#125069

elasticsearchmachine merged 3 commits intoelastic:8.16elastic/elasticsearch:8.16from

mosche:backport/8.16/pr-124732mosche/elasticsearch:backport/8.16/pr-124732Copy head branch name to clipboard