[7.17](backport #30668) libbeat: Don't force an ignore_above limit on wildcard fields

[mergify]

This is an automatic backport of pull request #30668 done by Mergify.
Cherry-pick of 677229f has failed:

On branch mergify/bp/7.17/pr-30668
Your branch is up to date with 'origin/7.17'.

You are currently cherry-picking commit 677229fa34.
  (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)

Changes to be committed:
	modified:   CHANGELOG-developer.next.asciidoc
	modified:   CHANGELOG.next.asciidoc
	modified:   libbeat/template/processor.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   libbeat/template/processor_test.go

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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[botelastic]

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[mergify]

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

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• Start Time: 2022-03-07T17:17:34.721+0000

• Duration: 103 min 58 sec

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Test	Results
Failed	0
Passed	55414
Skipped	5359
Total	60773

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[mergify]

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

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b mergify/bp/7.17/pr-30668 upstream/mergify/bp/7.17/pr-30668
git merge upstream/7.17
git push upstream mergify/bp/7.17/pr-30668