[Backport 2.x] [Segment Replication] Add changelog entry and fix allocation test

[opensearch-trigger-bot]

Backport f8102d1 from #6250.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/10936/
• CommitID: 5a08fb4
  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?

[dreamer-89]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/10936/
• CommitID: 5a08fb4
  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?

RemoteStoreIT.testRemoteSegmentStoreRestore test failure.

REPRODUCE WITH: ./gradlew ':server:internalClusterTest' --tests "org.opensearch.remotestore.RemoteStoreIT.testRemoteSegmentStoreRestore" -Dtests.seed=A212B9AEEBA86195 -Dtests.security.manager=true -Dtests.jvm.argline="-XX:TieredStopAtLevel=1 -XX:ReservedCodeCacheSize=64m" -Dtests.locale=is-IS -Dtests.timezone=Pacific/Tarawa -Druntime.java=17

org.opensearch.remotestore.RemoteStoreIT > testRemoteSegmentStoreRestore FAILED
    java.lang.AssertionError: timed out waiting for green state
        at __randomizedtesting.SeedInfo.seed([A212B9AEEBA86195:36ECBC37D1E17245]:0)
        at org.junit.Assert.fail(Assert.java:89)
        at org.opensearch.test.OpenSearchIntegTestCase.ensureColor(OpenSearchIntegTestCase.java:1007)
        at org.opensearch.test.OpenSearchIntegTestCase.ensureGreen(OpenSearchIntegTestCase.java:938)
        at org.opensearch.test.OpenSearchIntegTestCase.ensureGreen(OpenSearchIntegTestCase.java:927)
        at org.opensearch.remotestore.RemoteStoreIT.testRemoteSegmentStoreRestore(RemoteStoreIT.java:165)

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/10942/
• CommitID: 5a08fb4

[codecov-commenter]

Codecov Report

Merging #6270 (5a08fb4) into 2.x (c0411f3) will decrease coverage by 0.03%.
The diff coverage is n/a.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@             Coverage Diff              @@
##                2.x    #6270      +/-   ##
============================================
- Coverage     70.49%   70.46%   -0.03%     
- Complexity    59059    59086      +27     
============================================
  Files          4778     4778              
  Lines        283194   283194              
  Branches      41232    41232              
============================================
- Hits         199628   199551      -77     
- Misses        66895    67007     +112     
+ Partials      16671    16636      -35     

Impacted Files	Coverage Δ
...adonly/AddIndexBlockClusterStateUpdateRequest.java	0.00% <0.00%> (-75.00%)	⬇️
...readonly/TransportVerifyShardIndexBlockAction.java	9.75% <0.00%> (-58.54%)	⬇️
...opensearch/persistent/PersistentTasksExecutor.java	22.22% <0.00%> (-44.45%)	⬇️
...indices/readonly/TransportAddIndexBlockAction.java	20.68% <0.00%> (-37.94%)	⬇️
...java/org/opensearch/threadpool/ThreadPoolInfo.java	56.25% <0.00%> (-37.50%)	⬇️
...nsearch/index/shard/IndexShardClosedException.java	66.66% <0.00%> (-33.34%)	⬇️
.../indices/readonly/AddIndexBlockRequestBuilder.java	0.00% <0.00%> (-33.34%)	⬇️
...search/search/aggregations/pipeline/EwmaModel.java	24.44% <0.00%> (-28.89%)	⬇️
...opensearch/snapshots/SnapshotMissingException.java	28.57% <0.00%> (-28.58%)	⬇️
...va/org/opensearch/client/sniff/SnifferBuilder.java	72.72% <0.00%> (-27.28%)	⬇️
... and 493 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.