[Backport 2.x] add groupId = org.opensearch.plugin

[ankitkala]

Backport 5882c09 from #589

[codecov-commenter]

Codecov Report

Merging #593 (e062dab) into 2.x (569c0ab) will decrease coverage by 0.30%.
The diff coverage is n/a.

❗ Current head e062dab differs from pull request most recent head 9171f43. Consider uploading reports for the commit 9171f43 to get more accurate results

@@             Coverage Diff              @@
##                2.x     #593      +/-   ##
============================================
- Coverage     73.17%   72.86%   -0.31%     
+ Complexity      985      983       -2     
============================================
  Files           141      141              
  Lines          4592     4592              
  Branches        506      506              
============================================
- Hits           3360     3346      -14     
- Misses          916      932      +16     
+ Partials        316      314       -2     

Impacted Files	Coverage Δ
...cation/action/changes/TransportGetChangesAction.kt	63.49% <0.00%> (-25.40%)	⬇️
...arch/replication/metadata/UpdateMetadataRequest.kt	77.27% <0.00%> (-22.73%)	⬇️
...rch/replication/task/index/IndexReplicationTask.kt	67.66% <0.00%> (+0.22%)	⬆️
.../action/status/TransportReplicationStatusAction.kt	97.82% <0.00%> (+1.08%)	⬆️
...rch/replication/task/shard/ShardReplicationTask.kt	75.91% <0.00%> (+2.18%)	⬆️
...ation/task/shard/ShardReplicationChangesTracker.kt	63.63% <0.00%> (+3.03%)	⬆️
...earch/replication/metadata/UpdateIndexBlockTask.kt	77.41% <0.00%> (+3.22%)	⬆️

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