[7.x](backport #26880) [Filebeat] Update Elasticsearch Deprecation fileset parsing

[mergify]

This is an automatic backport of pull request #26880 done by Mergify.

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[elasticmachine]

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• Start Time: 2021-07-28T10:10:00.644+0000

• Duration: 103 min 9 sec

• Commit: 05b6de8

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Test	Results
Failed	0
Passed	14266
Skipped	2327
Total	16593

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Test stats 🧪

Test	Results
Failed	0
Passed	14266
Skipped	2327
Total	16593

[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.x/pr-26880 upstream/mergify/bp/7.x/pr-26880
git merge upstream/7.x
git push upstream mergify/bp/7.x/pr-26880