[7.9] fix: ensure ES index names are lowercase (#4295)

[simitt]

Backports the following commits to 7.9:

• fix: ensure ES index names are lowercase (fix: ensure ES index names are lowercase #4295)

[apmmachine]

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Build stats

• Build Cause: [Pull request #4304 updated]

• Start Time: 2020-10-12T12:21:16.610+0000

• Duration: 25 min 0 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3009
Skipped	149
Total	3158

Steps errors

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• Name: Compress

  • Description: tar --exclude=coverage-files.tgz -czf coverage-files.tgz coverage

  • Duration: 0 min 0 sec

  • Start Time: 2020-10-12T12:35:24.759+0000

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• Name: Compress

  • Description: tar --exclude=system-tests-linux-files.tgz -czf system-tests-linux-files.tgz system-tests

  • Duration: 0 min 0 sec

  • Start Time: 2020-10-12T12:46:14.792+0000

  • log

• Name: Test Sync

  • Description: ./script/jenkins/sync.sh

  • Duration: 3 min 41 sec

  • Start Time: 2020-10-12T12:30:39.554+0000

  • log