[8.0](backport #28667) Explicitly warns about misconfiguration preventing Filebeat to start …

[mergify]

This is an automatic backport of pull request #28667 done by Mergify.
Cherry-pick of b3789b5 has failed:

On branch mergify/bp/8.0/pr-28667
Your branch is up to date with 'origin/8.0'.

You are currently cherry-picking commit b3789b56fc.
  (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:   x-pack/filebeat/input/awss3/config.go

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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[elasticmachine]

💔 Build Failed

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Build stats

• Start Time: 2021-11-11T10:08:18.671+0000

• Duration: 13 min 18 sec

• Commit: 5758403

Test stats 🧪

Test	Results
Failed	0
Passed	3
Skipped	0
Total	3

Steps errors

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x-pack/filebeat-lint - make -C x-pack/filebeat check;make -C x-pack/filebeat update;make -C filebe

• Took 1 min 48 sec . View more details here
• Description: make -C x-pack/filebeat check;make -C x-pack/filebeat update;make -C filebeat check;make -C filebeat update;make check-no-changes;

Error signal

• Took 0 min 0 sec . View more details here
• Description: Error 'hudson.AbortException: script returned exit code 2'

💚 Flaky test report

Tests succeeded.

🤖 GitHub comments

To re-run your PR in the CI, just comment with:

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• /package : Generate the packages and run the E2E tests.

• /beats-tester : Run the installation tests with beats-tester.

[elasticmachine]

💔 Build Failed

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Build stats

• Start Time: 2021-11-11T10:57:23.947+0000

• Duration: 3 min 33 sec

• Commit: 3268784

Steps errors

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Git fetch

• Took 0 min 2 sec . View more details here
• Description: git fetch https://${GIT_USERNAME}:${GIT_PASSWORD}@github.com/elastic/beats.git +refs/pull/*/head:refs/remotes/origin/pr/* > fetch.log 2>&1

Archive the artifacts

• Took 0 min 1 sec . View more details here
• Description: fetch.log

❕ Flaky test report

No test was executed to be analysed.

🤖 GitHub comments

To re-run your PR in the CI, just comment with:

• /test : Re-trigger the build.

• /package : Generate the packages and run the E2E tests.

• /beats-tester : Run the installation tests with beats-tester.