[2.x] Bump version and fix core refactor

[junqiu-lei]

Description

Bump version and fix core refactor on 2.x branch.

Check List

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[junqiu-lei]

The CI will be expected to fail because of core snapshot 2.10.0 isn't yet out.

[navneet1v]

@junqiu-lei can we fix : WhiteSource Security Check?

[navneet1v]

The CI will be expected to fail because of core snapshot 2.10.0 isn't yet out.

are you saying OpenSearch core 2.10 version is not out?

[junqiu-lei]

@navneet1v The 2.10.0-SNAPSHOT was just out several hours ago, will check WhiteSource Security error.

[junqiu-lei]

WhiteSource Security issue is unrelated to this PR. I raised a new PR for WhiteSource Security fix to main and 2.x #1010.

[codecov]

Codecov Report

Merging #1006 (b94670b) into 2.x (24e9fb3) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##                2.x    #1006   +/-   ##
=========================================
  Coverage     85.16%   85.16%           
  Complexity     1145     1145           
=========================================
  Files           154      154           
  Lines          4693     4693           
  Branches        426      426           
=========================================
  Hits           3997     3997           
  Misses          504      504           
  Partials        192      192           

Files Changed	Coverage Δ
...xception/DeleteModelWhenInTrainStateException.java	100.00% <ø> (ø)
...ava/org/opensearch/knn/index/KNNMethodContext.java	92.50% <ø> (ø)
...g/opensearch/knn/index/MethodComponentContext.java	91.13% <ø> (ø)
...rg/opensearch/knn/index/query/KNNQueryBuilder.java	85.18% <ø> (ø)
...rc/main/java/org/opensearch/knn/indices/Model.java	83.92% <ø> (ø)
...ava/org/opensearch/knn/indices/ModelGraveyard.java	88.50% <ø> (ø)
...java/org/opensearch/knn/indices/ModelMetadata.java	97.19% <ø> (ø)
...in/java/org/opensearch/knn/indices/ModelState.java	89.47% <ø> (ø)
...main/java/org/opensearch/knn/plugin/KNNPlugin.java	100.00% <ø> (ø)
...ensearch/knn/plugin/rest/RestKNNWarmupHandler.java	100.00% <ø> (ø)
... and 40 more