[Backport 2.19] [Bugfix] Fix flakiness in TieredSpilloverCacheStatsIT.testClosingShard()

[opensearch-trigger-bot]

Backport aed1264 from #18204.

[github-actions]

❌ Gradle check result for ef4f9b3: 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 ef4f9b3: 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 ef4f9b3: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.98%. Comparing base (e53c0c8) to head (ef4f9b3).
Report is 5 commits behind head on 2.19.

Additional details and impacted files

@@             Coverage Diff              @@
##               2.19   #18207      +/-   ##
============================================
- Coverage     72.07%   71.98%   -0.10%     
+ Complexity    66053    66007      -46     
============================================
  Files          5341     5341              
  Lines        307182   307182              
  Branches      44832    44832              
============================================
- Hits         221415   221115     -300     
- Misses        67319    67655     +336     
+ Partials      18448    18412      -36     

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