[Segment Replication] Added mixed and rolling upgrade bwc test

[dreamer-89]

Description

1. Adds a mixed cluster bwc test with segment replication enabled. This test does not cover the case where replica shard exists on lower OS version node. This is because of NodeVersionAllocationDecider, which prevents replica shard allocation on lower OS version nodes.
2. Adds rolling upgrade bwc test that covers the case when replica can run on older OS version nodes. This test at current state should fail when bwc branch contains a different codec.

Related Issues

#7490

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.

[mch2]

@dreamer-89 Needs a rebase to pick up bwc fix.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/15459/
• CommitID: ec67769

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.upgrades.IndexingIT.testIndexingWithSegRep
      1 org.opensearch.remotestore.RemoteStoreRefreshListenerIT.testRemoteRefreshRetryOnFailure
      1 org.opensearch.cluster.allocation.AwarenessAllocationIT.testThreeZoneOneReplicaWithForceZoneValueAndLoadAwareness

• URL: https://build.ci.opensearch.org/job/gradle-check/15640/
• CommitID: 5e76b2f
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[dreamer-89]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.upgrades.IndexingIT.testIndexingWithSegRep
      1 org.opensearch.remotestore.RemoteStoreRefreshListenerIT.testRemoteRefreshRetryOnFailure
      1 org.opensearch.cluster.allocation.AwarenessAllocationIT.testThreeZoneOneReplicaWithForceZoneValueAndLoadAwareness

• URL: https://build.ci.opensearch.org/job/gradle-check/15640/
• CommitID: 5e76b2f
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

Failed due to null node filter, which happens there is no replica returned from {indexName}/_stats API call. Test failure is not reproable. Updated logic to fetch replica doc count only when it is avaialble.

org.opensearch.client.ResponseException: method [POST], host [http://127.0.0.1:34741/], URI [/test-index-segrep/_search?rest_total_hits_as_int=true&filter_path=hits.total&preference=_shards%3A0%7C_only_nodes%3Anull], status line [HTTP/1.1 400 Bad Request]
    {"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"no data nodes with criteria [null] found for shard: [test-index-segrep][0]"}],"type":"illegal_argument_exception","reason":"no data nodes with criteria [null] found for shard: [test-index-segrep][0]"},"status":400}

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/15644/
• CommitID: 85f2f11

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.remotestore.SegmentReplicationRemoteStoreIT.testPressureServiceStats
      1 org.opensearch.index.remote.RemoteRefreshSegmentPressureServiceTests.testValidateSegmentUploadLag
      1 org.opensearch.cluster.allocation.ClusterRerouteIT.testDelayWithALargeAmountOfShards
      1 org.opensearch.cluster.allocation.AwarenessAllocationIT.testThreeZoneOneReplicaWithForceZoneValueAndLoadAwareness

• URL: https://build.ci.opensearch.org/job/gradle-check/15678/
• CommitID: 2eb2174
  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]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-7537-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 0788feb946e459b500dd807682cbeb0e05c30fc2
# Push it to GitHub
git push --set-upstream origin backport/backport-7537-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-7537-to-2.x.