2.1 release note

[bowenlan-amzn]

Signed-off-by: bowenlan-amzn bowenlan23@gmail.com

Issue #, if available:

Description of changes:

CheckList:

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[codecov-commenter]

Codecov Report

Merging #405 (96c5658) into main (fd06db7) will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #405      +/-   ##
============================================
+ Coverage     75.68%   75.71%   +0.02%     
- Complexity     2460     2464       +4     
============================================
  Files           313      313              
  Lines         14426    14426              
  Branches       2230     2230              
============================================
+ Hits          10919    10923       +4     
+ Misses         2263     2257       -6     
- Partials       1244     1246       +2     

Impacted Files	Coverage Δ
...ensearch/indexmanagement/util/JobSchedulerUtils.kt	73.91% <0.00%> (-8.70%)	⬇️
.../rollup/action/start/TransportStartRollupAction.kt	72.94% <0.00%> (-2.36%)	⬇️
...management/indexstatemanagement/MetadataService.kt	62.68% <0.00%> (-2.24%)	⬇️
...nt/indexstatemanagement/ManagedIndexCoordinator.kt	68.71% <0.00%> (-1.17%)	⬇️
.../opensearch/indexmanagement/rollup/model/Rollup.kt	86.04% <0.00%> (-0.47%)	⬇️
...earch/indexmanagement/transform/model/Transform.kt	85.47% <0.00%> (ø)
...nsform/action/stop/TransportStopTransformAction.kt	77.77% <0.00%> (ø)
...gement/indexstatemanagement/action/ShrinkAction.kt	72.05% <0.00%> (+1.47%)	⬆️
...ent/indexstatemanagement/util/ManagedIndexUtils.kt	77.87% <0.00%> (+1.76%)	⬆️
.../action/explain/TransportExplainTransformAction.kt	73.03% <0.00%> (+2.24%)	⬆️
... and 3 more

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