[8.1] Remote Elasticsearch cluster is not supported (backport #2296)

[mergify]

This is an automatic backport of pull request #2296 done by Mergify.
Cherry-pick of 891f92a has failed:

On branch mergify/bp/8.1/pr-2296
Your branch is up to date with 'origin/8.1'.

You are currently cherry-picking commit 891f92ad.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   docs/en/ingest-management/fleet/fleet-settings.asciidoc

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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[mergify]

This pull request has not been merged yet. Could you please review and merge it @nimarezainia? 🙏

[bmorelli25]

Only exists in v8.2+