Fix flaky test FieldSortIT.testIssue6614

[Poojita-Raj]

Description

testIssue6614 was a flaky test failing intermittently due to FileSystemException "Too many open files". This was caused due to the high number of shards created by the test (~750 shards).

Reducing the range of possible number of indices created solved this issue with minimal change required to underlying OpenSearchIntegTestCase and the rest of the randomized parameters for the test (shards, replicas, data nodes, etc). It also doesn't affect the logic of the test.

More details in linked issue.

Related Issues

Resolves #11347

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 e22fcb5

Incompatible components

Skipped components

Compatible components

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

[github-actions]

✅ Gradle check result for e22fcb5: SUCCESS

[codecov]

Codecov Report

Attention: 60 lines in your changes are missing coverage. Please review.

Comparison is base (445bf1f) 71.36% compared to head (e22fcb5) 71.31%.
Report is 7 commits behind head on main.

Files	Patch %	Lines
...opensearch/ingest/common/CommunityIdProcessor.java	85.95%	15 Missing and 18 partials ⚠️
...h/aggregations/bucket/FastFilterRewriteHelper.java	81.66%	9 Missing and 13 partials ⚠️
...egations/bucket/composite/CompositeAggregator.java	90.47%	1 Missing and 1 partial ⚠️
...search/ingest/common/IngestCommonModulePlugin.java	0.00%	1 Missing ⚠️
...ions/bucket/histogram/DateHistogramAggregator.java	87.50%	0 Missing and 1 partial ⚠️
.../org/opensearch/telemetry/tracing/SpanBuilder.java	95.23%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12259      +/-   ##
============================================
- Coverage     71.36%   71.31%   -0.06%     
- Complexity    59643    59724      +81     
============================================
  Files          4954     4955       +1     
  Lines        280695   281022     +327     
  Branches      40780    40841      +61     
============================================
+ Hits         200319   200405      +86     
- Misses        63688    63924     +236     
- Partials      16688    16693       +5     

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