Backporting multiple 2.* release notes from main to the 2.x branch

[kartg]

Signed-off-by: Kartik Ganesh [email protected]

Description

Backporting multiple 2.* release notes from main to the 2.x branch

Issues Resolved

N/A

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

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: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/1521/
• CommitID: 7cbcf14

[codecov-commenter]

Codecov Report

Merging #4154 (7cbcf14) into 2.x (ce9b988) will decrease coverage by 0.11%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #4154      +/-   ##
============================================
- Coverage     70.60%   70.48%   -0.12%     
+ Complexity    56769    56711      -58     
============================================
  Files          4557     4557              
  Lines        272873   272873              
  Branches      40055    40055              
============================================
- Hits         192661   192346     -315     
- Misses        64049    64409     +360     
+ Partials      16163    16118      -45     

Impacted Files	Coverage Δ
...adonly/AddIndexBlockClusterStateUpdateRequest.java	0.00% <0.00%> (-75.00%)	⬇️
...readonly/TransportVerifyShardIndexBlockAction.java	9.75% <0.00%> (-58.54%)	⬇️
...n/admin/indices/readonly/AddIndexBlockRequest.java	17.85% <0.00%> (-53.58%)	⬇️
...ava/org/opensearch/action/NoSuchNodeException.java	0.00% <0.00%> (-50.00%)	⬇️
...ch/transport/ReceiveTimeoutTransportException.java	50.00% <0.00%> (-50.00%)	⬇️
...cluster/coordination/PendingClusterStateStats.java	20.00% <0.00%> (-48.00%)	⬇️
...opensearch/persistent/PersistentTasksExecutor.java	22.22% <0.00%> (-44.45%)	⬇️
...rch/client/transport/NoNodeAvailableException.java	28.57% <0.00%> (-42.86%)	⬇️
...indices/readonly/TransportAddIndexBlockAction.java	20.68% <0.00%> (-41.38%)	⬇️
...h/action/ingest/SimulateDocumentVerboseResult.java	60.71% <0.00%> (-39.29%)	⬇️
... and 497 more

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[dreamer-89]

Should this be moved under Deprecations ?