Adding 2.6 to bwc versions

[saratvemulapalli]

Signed-off-by: Sarat Vemulapalli [email protected]

Description

Adding 2.6 to BWC versions.

Issues Resolved

Part of #5705

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: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/8993/
• CommitID: 89433d1
  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?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.indices.stats.IndexStatsIT.testFilterCacheStats

• URL: https://build.ci.opensearch.org/job/gradle-check/8997/
• CommitID: 89433d1
  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 #5745 (89433d1) into main (7fc15a4) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #5745      +/-   ##
============================================
- Coverage     71.07%   71.02%   -0.05%     
+ Complexity    58799    58727      -72     
============================================
  Files          4767     4767              
  Lines        280160   280161       +1     
  Branches      40442    40442              
============================================
- Hits         199125   198996     -129     
- Misses        64842    64967     +125     
- Partials      16193    16198       +5     

Impacted Files	Coverage Δ
server/src/main/java/org/opensearch/Version.java	77.29% <100.00%> (+0.11%)	⬆️
...gations/bucket/composite/CompositeAggregation.java	15.00% <0.00%> (-85.00%)	⬇️
...adonly/AddIndexBlockClusterStateUpdateRequest.java	0.00% <0.00%> (-75.00%)	⬇️
...readonly/TransportVerifyShardIndexBlockAction.java	9.75% <0.00%> (-73.18%)	⬇️
...a/org/opensearch/client/cluster/ProxyModeInfo.java	0.00% <0.00%> (-55.00%)	⬇️
...n/admin/indices/readonly/AddIndexBlockRequest.java	17.85% <0.00%> (-53.58%)	⬇️
.../index/shard/IndexShardNotRecoveringException.java	0.00% <0.00%> (-50.00%)	⬇️
...adcast/BroadcastShardOperationFailedException.java	55.55% <0.00%> (-44.45%)	⬇️
...indices/readonly/TransportAddIndexBlockAction.java	20.68% <0.00%> (-41.38%)	⬇️
...aggregations/bucket/composite/ParsedComposite.java	44.44% <0.00%> (-40.75%)	⬇️
... and 487 more

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