[Backport 2.x] Validate attributes of routing nodes for Routing Weights API

[imRishN]

Description

Backports #5607

Issues Resolved

[List any issues this PR will resolve]

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
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

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.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/8774/
• CommitID: fed1f0e

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.action.bulk.BulkWithUpdatesIT.testThatMissingIndexDoesNotAbortFullBulkRequest
      1 org.opensearch.action.bulk.BulkWithUpdatesIT.testThatFailedUpdateRequestReturnsCorrectType
      1 org.opensearch.action.bulk.BulkWithUpdatesIT.testInvalidIndexNamesCorrectOpType
      1 org.opensearch.action.bulk.BulkWithUpdatesIT.testBulkUpdateWithScriptedUpsertAndDynamicMappingUpdate
      1 org.opensearch.action.bulk.BulkWithUpdatesIT.testBulkUpdateSimple
      1 org.opensearch.action.bulk.BulkWithUpdatesIT.testBulkUpdateLargerVolume
      1 org.opensearch.action.bulk.BulkWithUpdatesIT.testBulkIndexingWhileInitializing

• URL: https://build.ci.opensearch.org/job/gradle-check/8775/
• CommitID: 9c61aaf
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov-commenter]

Codecov Report

Merging #5691 (9c61aaf) into 2.x (8dc5ddf) will decrease coverage by 0.01%.
The diff coverage is 92.00%.

@@             Coverage Diff              @@
##                2.x    #5691      +/-   ##
============================================
- Coverage     70.69%   70.68%   -0.02%     
- Complexity    58651    58721      +70     
============================================
  Files          4740     4740              
  Lines        280526   280542      +16     
  Branches      40883    40889       +6     
============================================
- Hits         198312   198290      -22     
- Misses        65755    65812      +57     
+ Partials      16459    16440      -19     

Impacted Files	Coverage Δ
...arch/cluster/decommission/DecommissionService.java	35.88% <0.00%> (-0.91%)	⬇️
...search/cluster/routing/WeightedRoutingService.java	79.43% <92.30%> (+1.88%)	⬆️
...weighted/put/ClusterPutWeightedRoutingRequest.java	67.60% <100.00%> (+5.31%)	⬆️
...adonly/AddIndexBlockClusterStateUpdateRequest.java	0.00% <0.00%> (-75.00%)	⬇️
...n/admin/indices/readonly/AddIndexBlockRequest.java	17.85% <0.00%> (-53.58%)	⬇️
...adcast/BroadcastShardOperationFailedException.java	55.55% <0.00%> (-44.45%)	⬇️
.../org/opensearch/client/indices/AnalyzeRequest.java	31.00% <0.00%> (-42.00%)	⬇️
...readonly/TransportVerifyShardIndexBlockAction.java	9.75% <0.00%> (-41.47%)	⬇️
...indices/readonly/TransportAddIndexBlockAction.java	20.68% <0.00%> (-41.38%)	⬇️
...cluster/coordination/PublishClusterStateStats.java	33.33% <0.00%> (-37.51%)	⬇️
... and 483 more

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