[Backport 2.x] Handle translog upload during primary relocation for remote-backed indexes (#5804)

[ashking94]

• Upload translog only if primaryMode is true

Signed-off-by: Ashish Singh ssashish@amazon.com

Description

Original PR - #5804
Solves #5795 & #5844.

Issues Resolved

Original PR - #5804
Solves #5795 & #5844.

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      2 org.opensearch.indices.replication.SegmentReplicationRelocationIT.testPrimaryRelocation

• URL: https://build.ci.opensearch.org/job/gradle-check/10148/
• CommitID: 83926d0
  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-commenter]

Codecov Report

Merging #6064 (83926d0) into 2.x (579f1a6) will increase coverage by 0.06%.
The diff coverage is 78.12%.

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@@             Coverage Diff              @@
##                2.x    #6064      +/-   ##
============================================
+ Coverage     70.37%   70.43%   +0.06%     
- Complexity    58890    58932      +42     
============================================
  Files          4769     4769              
  Lines        282621   282643      +22     
  Branches      41169    41171       +2     
============================================
+ Hits         198899   199087     +188     
+ Misses        67063    66925     -138     
+ Partials      16659    16631      -28     

Impacted Files	Coverage Δ
...search/index/translog/InternalTranslogFactory.java	100.00% <ø> (ø)
...anslog/RemoteBlobStoreInternalTranslogFactory.java	75.00% <ø> (ø)
...earch/index/translog/WriteOnlyTranslogManager.java	40.00% <ø> (ø)
...n/java/org/opensearch/index/engine/NoOpEngine.java	60.37% <50.00%> (+0.37%)	⬆️
...va/org/opensearch/index/engine/ReadOnlyEngine.java	72.02% <50.00%> (+0.76%)	⬆️
...in/java/org/opensearch/index/shard/IndexShard.java	70.03% <58.33%> (-0.01%)	⬇️
...java/org/opensearch/index/engine/EngineConfig.java	98.46% <100.00%> (+0.04%)	⬆️
...g/opensearch/index/engine/EngineConfigFactory.java	92.85% <100.00%> (+0.10%)	⬆️
...va/org/opensearch/index/engine/InternalEngine.java	73.38% <100.00%> (-1.11%)	⬇️
.../opensearch/index/engine/NRTReplicationEngine.java	77.63% <100.00%> (+0.13%)	⬆️
... and 478 more

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