Add codec compare in shouldUpgrade method of OpenSearchMergePolicy

[MrChaos1993]

Description

Allow to use UpgradeRequest to change codecs.

Related Issues

Related to description in #13569

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

❌ Gradle check result for e2f2630: FAILURE

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❌ Gradle check result for cf087bd: FAILURE

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❌ Gradle check result for e0dc807: FAILURE

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[github-actions]

❌ Gradle check result for 8f7be3a: FAILURE

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[github-actions]

❕ Gradle check result for 393c257: UNSTABLE

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[codecov]

Codecov Report

Attention: Patch coverage is 81.25000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 72.52%. Comparing base (dcad6b8) to head (bf9debd).
Report is 292 commits behind head on main.

Files with missing lines	Patch %	Lines
.../opensearch/index/shard/OpenSearchMergePolicy.java	78.57%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17491      +/-   ##
============================================
+ Coverage     72.46%   72.52%   +0.05%     
- Complexity    65757    65814      +57     
============================================
  Files          5311     5312       +1     
  Lines        305001   305024      +23     
  Branches      44230    44238       +8     
============================================
+ Hits         221022   221215     +193     
+ Misses        65932    65663     -269     
- Partials      18047    18146      +99     

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[github-actions]

❌ Gradle check result for 9444805: FAILURE

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[github-actions]

❕ Gradle check result for 7951dda: UNSTABLE

• TEST FAILURES:

      2 org.opensearch.snapshots.DedicatedClusterSnapshotRestoreIT.testSnapshotWithStuckNode

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[github-actions]

❌ Gradle check result for f62e304: FAILURE

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[github-actions]

❕ Gradle check result for c97259d: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.remotestore.RemoteStoreStatsIT.testNonZeroPrimaryStatsOnNewlyCreatedIndexWithZeroDocs

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[github-actions]

❕ Gradle check result for fb26dc0: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.snapshots.DedicatedClusterSnapshotRestoreIT.testSnapshotWithStuckNode

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[github-actions]

✅ Gradle check result for 06c44fd: SUCCESS

[github-actions]

❕ Gradle check result for bf9debd: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.snapshots.DedicatedClusterSnapshotRestoreIT.testSnapshotWithStuckNode

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[opensearch-trigger-bot]

This PR is stalled because it has been open for 30 days with no activity.

[opensearch-trigger-bot]

This PR is stalled because it has been open for 30 days with no activity.

[github-actions]

❌ Gradle check result for 03d2c43: FAILURE

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[github-actions]

❌ Gradle check result for 8f178e2: FAILURE

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[opensearch-trigger-bot]

This PR is stalled because it has been open for 30 days with no activity.