Fix org.opensearch.rest.action.admin.cluster.RestNodesStatsActionTests.testIndexMetricsRequestWithoutIndicesMetric is flaky

[gaobinlong]

Description

This PR fixes the flaky test org.opensearch.rest.action.admin.cluster.RestNodesStatsActionTests.testIndexMetricsRequestWithoutIndicesMetric(), this bug is caused by a new metric type caches which was introduced in this PR: #13237, the caches type is handled separately when prepare the node stats request, so we should remove the caches type from the metrics set in the test method testIndexMetricsRequestWithoutIndicesMetric(), and add a new test case to make sure that the caches type can be covered by the unit tests.

Changelog is not needed, but backport is 2.x is needed.

Related Issues

#13504

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• API changes companion pull request created.
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• Public documentation issue/PR created

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[github-actions]

❌ Gradle check result for d645d43: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[gaobinlong]

❌ Gradle check result for d645d43: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

Known issue:#13600

[github-actions]

❌ Gradle check result for f698d09: FAILURE

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[github-actions]

❌ Gradle check result for f698d09: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 15c1632: FAILURE

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[gaobinlong]

❌ Gradle check result for 15c1632: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

Known issue: #6542.

[github-actions]

❌ Gradle check result for c71e3d3: FAILURE

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[reta]

Needs #13673 :(

[reta]

@gaobinlong could you rebase please? thank you

[github-actions]

❌ Gradle check result for f56b039: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[reta]

❌ Gradle check result for f56b039: FAILURE

#7791
#13711

[github-actions]

❌ Gradle check result for f56b039: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[reta]

❌ Gradle check result for f56b039: FAILURE

java.lang.Exception: Test abandoned because suite timeout was reached.
	at __randomizedtesting.SeedInfo.seed([7618A989E9259E68]:0)

[github-actions]

✅ Gradle check result for f56b039: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.60%. Comparing base (b15cb0c) to head (f56b039).
Report is 287 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #13658      +/-   ##
============================================
+ Coverage     71.42%   71.60%   +0.18%     
- Complexity    59978    61221    +1243     
============================================
  Files          4985     5059      +74     
  Lines        282275   287522    +5247     
  Branches      40946    41646     +700     
============================================
+ Hits         201603   205890    +4287     
- Misses        63999    64668     +669     
- Partials      16673    16964     +291     

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