Incremented version to 2.0.1

[zelinh]

Description

Increment version to 2.0.1
Part of opensearch-project/opensearch-build#2165

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.

[codecov-commenter]

Codecov Report

Merging #428 (a1c64ab) into 2.0 (385dcb7) will decrease coverage by 2.36%.
The diff coverage is n/a.

❗ Current head a1c64ab differs from pull request most recent head 7771660. Consider uploading reports for the commit 7771660 to get more accurate results

@@             Coverage Diff              @@
##                2.0     #428      +/-   ##
============================================
- Coverage     72.70%   70.34%   -2.37%     
+ Complexity      975      940      -35     
============================================
  Files           141      141              
  Lines          4562     4562              
  Branches        504      504              
============================================
- Hits           3317     3209     -108     
- Misses          928     1032     +104     
- Partials        317      321       +4     

Impacted Files	Coverage Δ
...earch/replication/action/stats/NodeStatsRequest.kt	33.33% <0.00%> (-66.67%)	⬇️
...eplication/action/stats/LeaderNodeStatsResponse.kt	42.85% <0.00%> (-57.15%)	⬇️
.../replication/action/replay/ReplayChangesRequest.kt	50.00% <0.00%> (-50.00%)	⬇️
...arch/replication/metadata/UpdateMetadataRequest.kt	40.90% <0.00%> (-36.37%)	⬇️
...replication/action/index/ReplicateIndexResponse.kt	33.33% <0.00%> (-33.34%)	⬇️
...tion/action/index/block/UpdateIndexBlockRequest.kt	35.00% <0.00%> (-30.00%)	⬇️
...replication/action/stats/AutoFollowStatsRequest.kt	71.42% <0.00%> (-28.58%)	⬇️
...opensearch/replication/seqno/RemoteClusterStats.kt	73.01% <0.00%> (-26.99%)	⬇️
...ction/autofollow/UpdateAutoFollowPatternRequest.kt	30.37% <0.00%> (-24.06%)	⬇️
.../replication/action/index/ReplicateIndexRequest.kt	38.82% <0.00%> (-23.53%)	⬇️
... and 33 more

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[saikaranam-amazon]

Security tests are failing as security plugin is tracking OS 2.0 on 2.0 branch (haven't moved to 2.0.1 yet)

| Exception in thread "main" java.lang.IllegalArgumentException: Plugin [opensearch-security] was built for OpenSearch version 2.0.0 but version 2.0.1 is running
| 	at org.opensearch.plugins.PluginsService.verifyCompatibility(PluginsService.java:394)
| 	at org.opensearch.plugins.InstallPluginCommand.loadPluginInfo(InstallPluginCommand.java:820)

[saikaranam-amazon]

@zelinh Once security plugin has updated, we can run the tests and proceed with the merge.