Fixed flaky and failing test cases for concurrent search

[e-emoto]

Description

This makes use of the indexRandomForConcurrentSearch function, which creates more segments for concurrent search tests, in several test cases for their concurrent search use-cases. The following test suites are affected by this change:

• RandomScoreFunctionIT.java
• FetchSubPhasePluginIT.java
• SearchWhileRelocatingIT.java

Related Issues

Resolves #11112
Resolves #11106

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• 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]

Compatibility status:

Checks if related components are compatible with change 1708c9e

Incompatible components

Incompatible components: [https://github.com/opensearch-project/performance-analyzer.git]

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/opensearch-oci-object-storage.git, https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/performance-analyzer-rca.git, https://github.com/opensearch-project/sql.git]

[github-actions]

✅ Gradle check result for b32a936: SUCCESS

[github-actions]

✅ Gradle check result for 1708c9e: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8077a26) 71.12% compared to head (1708c9e) 71.26%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #11184      +/-   ##
============================================
+ Coverage     71.12%   71.26%   +0.13%     
- Complexity    58788    58849      +61     
============================================
  Files          4883     4883              
  Lines        277152   277152              
  Branches      40281    40281              
============================================
+ Hits         197134   197521     +387     
+ Misses        63545    63146     -399     
- Partials      16473    16485      +12     

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[jed326]

@sohami @reta @andrross could you help review + merge this? Thanks!