[Backport 2.0] [Backport] Include default index settings during leader setting validation (#601)

[opensearch-trigger-bot]

Backport 198e38b from #609

[codecov-commenter]

Codecov Report

Merging #612 (3ceff74) into 2.0 (902e24e) will decrease coverage by 1.10%.
The diff coverage is 54.54%.

❗ Current head 3ceff74 differs from pull request most recent head 5d8b61d. Consider uploading reports for the commit 5d8b61d to get more accurate results

@@             Coverage Diff              @@
##                2.0     #612      +/-   ##
============================================
- Coverage     74.35%   73.25%   -1.11%     
+ Complexity      999      985      -14     
============================================
  Files           141      141              
  Lines          4578     4584       +6     
  Branches        504      505       +1     
============================================
- Hits           3404     3358      -46     
- Misses          855      914      +59     
+ Partials        319      312       -7     

Impacted Files	Coverage Δ
...tion/action/index/TransportReplicateIndexAction.kt	71.66% <54.54%> (-2.41%)	⬇️
...ch/replication/task/index/IndexReplicationState.kt	51.66% <0.00%> (-15.00%)	⬇️
...ication/action/setup/TransportSetupChecksAction.kt	59.52% <0.00%> (-14.29%)	⬇️
...ication/seqno/RemoteClusterRetentionLeaseHelper.kt	80.00% <0.00%> (-11.67%)	⬇️
...tion/repository/RemoteClusterMultiChunkTransfer.kt	90.24% <0.00%> (-9.76%)	⬇️
.../replication/metadata/store/ReplicationMetadata.kt	62.96% <0.00%> (-8.65%)	⬇️
...ication/action/stop/StopIndexReplicationRequest.kt	50.00% <0.00%> (-5.00%)	⬇️
...ion/action/resume/ResumeIndexReplicationRequest.kt	50.00% <0.00%> (-5.00%)	⬇️
...tlin/org/opensearch/replication/util/Extensions.kt	65.47% <0.00%> (-4.77%)	⬇️
...n/index/ReplicateIndexClusterManagerNodeRequest.kt	50.00% <0.00%> (-4.17%)	⬇️
... and 12 more

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