[Backport 2.1] [Backport] Include default index settings during leader setting validation (#601)

[opensearch-trigger-bot]

Backport 198e38b from #609

[codecov-commenter]

Codecov Report

Merging #614 (737d1b6) into 2.1 (e7b6541) will increase coverage by 1.16%.
The diff coverage is 54.54%.

@@             Coverage Diff              @@
##                2.1     #614      +/-   ##
============================================
+ Coverage     73.19%   74.36%   +1.16%     
- Complexity      983      999      +16     
============================================
  Files           141      141              
  Lines          4578     4584       +6     
  Branches        504      505       +1     
============================================
+ Hits           3351     3409      +58     
+ Misses          913      856      -57     
- Partials        314      319       +5     

Impacted Files	Coverage Δ
...tion/action/index/TransportReplicateIndexAction.kt	71.66% <54.54%> (-2.41%)	⬇️
...rch/replication/action/status/ShardInfoResponse.kt	72.26% <0.00%> (-19.33%)	⬇️
...replication/metadata/ReplicationMetadataManager.kt	63.80% <0.00%> (-2.86%)	⬇️
.../replication/action/index/ReplicateIndexRequest.kt	63.52% <0.00%> (+1.17%)	⬆️
...arch/replication/task/autofollow/AutoFollowTask.kt	73.85% <0.00%> (+1.96%)	⬆️
...org/opensearch/replication/util/SecurityContext.kt	73.52% <0.00%> (+2.94%)	⬆️
.../replication/repository/RemoteClusterRepository.kt	75.73% <0.00%> (+2.94%)	⬆️
...lication/action/status/TranportShardsInfoAction.kt	100.00% <0.00%> (+3.33%)	⬆️
...rch/replication/task/index/IndexReplicationTask.kt	71.10% <0.00%> (+3.44%)	⬆️
...ation/action/pause/PauseIndexReplicationRequest.kt	74.07% <0.00%> (+3.70%)	⬆️
... and 14 more

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