[7.x] Fix metadata.service.* fields requirements in json schema (#4142)

[simitt]

Backports the following commits to 7.x:

• Fix metadata.service.* fields requirements in json schema (Fix metadata.service.* fields requirements in json schema #4142)

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #4194 opened]

• Start Time: 2020-09-14T09:26:26.208+0000

• Duration: 29 min 16 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3063
Skipped	142
Total	3205

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: 2020-09-14T09:41:42.975+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: 2020-09-14T09:55:39.437+0000

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• Name: Test Sync

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

  • Duration: 3 min 52 sec

  • Start Time: 2020-09-14T09:35:38.757+0000

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