[Backport 2.x] Remove unused segment replication feature flag

[opensearch-trigger-bot]

Backport de78c7c from #11850.

[github-actions]

Compatibility status:

Checks if related components are compatible with change 55d9b17

Incompatible components

Incompatible components: [https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/k-nn.git]

Skipped components

Compatible components

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

[github-actions]

❕ Gradle check result for 55d9b17: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testRefreshAfterCommit
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterRefresh
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterMultipleCommits
      1 org.opensearch.index.shard.RemoteStoreRefreshListenerTests.testAfterCommit

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

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (a41646e) 71.16% compared to head (55d9b17) 71.12%.
Report is 3 commits behind head on 2.x.

Files	Patch %	Lines
...ch/common/xcontent/JsonToStringXContentParser.java	81.25%	1 Missing and 2 partials ⚠️
.../java/org/opensearch/index/codec/CodecService.java	66.66%	2 Missing ⚠️
...org/opensearch/index/fielddata/IndexFieldData.java	33.33%	1 Missing and 1 partial ⚠️
...eldcomparator/HalfFloatValuesComparatorSource.java	0.00%	1 Missing ⚠️
...comparator/UnsignedLongValuesComparatorSource.java	0.00%	1 Missing ⚠️
...opensearch/index/mapper/CompletionFieldMapper.java	0.00%	1 Missing ⚠️
.../index/search/comparators/HalfFloatComparator.java	0.00%	1 Missing ⚠️
...dex/search/comparators/UnsignedLongComparator.java	0.00%	1 Missing ⚠️
...opensearch/search/sort/GeoDistanceSortBuilder.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x   #11852      +/-   ##
============================================
- Coverage     71.16%   71.12%   -0.05%     
- Complexity    59378    59394      +16     
============================================
  Files          4889     4889              
  Lines        279821   279805      -16     
  Branches      41034    41032       -2     
============================================
- Hits         199141   199014     -127     
- Misses        63778    63958     +180     
+ Partials      16902    16833      -69     

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