[Backport 2.x] Replica Count Validation when awareness replica balance is enabled

[opensearch-trigger-bot]

Backport f64c0c7 from #429

[codecov-commenter]

Codecov Report

Merging #463 (f64c0c7) into 2.x (4811922) will decrease coverage by 0.03%.
The diff coverage is 67.59%.

❗ Current head f64c0c7 differs from pull request most recent head 235aa4c. Consider uploading reports for the commit 235aa4c to get more accurate results

@@             Coverage Diff              @@
##                2.x     #463      +/-   ##
============================================
- Coverage     75.96%   75.93%   -0.04%     
+ Complexity     2475     2469       -6     
============================================
  Files           314      314              
  Lines         14440    14454      +14     
  Branches       2233     2235       +2     
============================================
+ Hits          10969    10975       +6     
- Misses         2224     2226       +2     
- Partials       1247     1253       +6     

Impacted Files	Coverage Δ
...transport/action/explain/TransportExplainAction.kt	72.34% <0.00%> (ø)
.../opensearch/indexmanagement/rollup/model/Rollup.kt	86.04% <ø> (ø)
.../rollup/action/index/TransportIndexRollupAction.kt	71.26% <50.00%> (ø)
...nagement/step/rollup/AttemptCreateRollupJobStep.kt	48.38% <66.66%> (ø)
...arch/indexmanagement/rollup/RollupMapperService.kt	56.34% <76.47%> (ø)
...t/action/indexpolicy/TransportIndexPolicyAction.kt	80.32% <78.94%> (-0.23%)	⬇️
...xmanagement/indexstatemanagement/util/StepUtils.kt	87.64% <85.71%> (ø)
.../rollup/util/RollupFieldValueExpressionResolver.kt	90.00% <90.00%> (ø)
...management/rollup/interceptor/RollupInterceptor.kt	79.36% <92.30%> (+3.17%)	⬆️
...pensearch/indexmanagement/IndexManagementPlugin.kt	89.88% <100.00%> (ø)
... and 20 more

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