renamed master to clusterManager (#319)

[naveenpajjuri]

Signed-off-by: Naveen Pajjuri [email protected]

Description

Replaced the word master with cluster manager where ever possible.
We still have external packages like OS, etc where we have few paths with master nomenclature which can only be fixed later.

Issues Resolved

#319

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.
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[codecov-commenter]

Codecov Report

Merging #355 (26a92da) into main (d5318e6) will not change coverage.
The diff coverage is 0.00%.

❗ Current head 26a92da differs from pull request most recent head 27960e9. Consider uploading reports for the commit 27960e9 to get more accurate results

@@            Coverage Diff            @@
##               main     #355   +/-   ##
=========================================
  Coverage     10.90%   10.90%           
  Complexity      111      111           
=========================================
  Files           141      141           
  Lines          4559     4559           
  Branches        506      506           
=========================================
  Hits            497      497           
  Misses         3991     3991           
  Partials         71       71           

Impacted Files	Coverage Δ
...in/org/opensearch/replication/ReplicationPlugin.kt	23.77% <0.00%> (ø)
...n/autofollow/AutoFollowClusterManagerNodeAction.kt	0.00% <0.00%> (ø)
.../autofollow/AutoFollowClusterManagerNodeRequest.kt	0.00% <ø> (ø)
...low/TransportAutoFollowClusterManagerNodeAction.kt	0.00% <0.00%> (ø)
...tofollow/TransportUpdateAutoFollowPatternAction.kt	0.00% <0.00%> (ø)
...on/index/ReplicateIndexClusterManagerNodeAction.kt	0.00% <0.00%> (ø)
...tion/action/index/TransportReplicateIndexAction.kt	0.00% <0.00%> (ø)
...TransportReplicateIndexClusterManagerNodeAction.kt	0.00% <0.00%> (ø)
...tion/action/replay/TransportReplayChangesAction.kt	0.00% <ø> (ø)
...rch/replication/task/index/IndexReplicationTask.kt	25.75% <0.00%> (ø)

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