[Backport 2.5] Add Lucene specific file extensions to core HybridFS

[opensearch-trigger-bot]

Backport 8a2aa04 from #721

[codecov-commenter]

Codecov Report

Merging #725 (8a2aa04) into 2.5 (2b0bacf) will decrease coverage by 0.05%.
The diff coverage is 85.37%.

❗ Current head 8a2aa04 differs from pull request most recent head 70eb929. Consider uploading reports for the commit 70eb929 to get more accurate results

@@             Coverage Diff              @@
##                2.5     #725      +/-   ##
============================================
- Coverage     84.48%   84.43%   -0.06%     
- Complexity     1063     1072       +9     
============================================
  Files           149      152       +3     
  Lines          4332     4356      +24     
  Branches        392      389       -3     
============================================
+ Hits           3660     3678      +18     
- Misses          492      498       +6     
  Partials        180      180              

Impacted Files	Coverage Δ
...n/java/org/opensearch/knn/common/KNNConstants.java	93.33% <ø> (ø)
.../main/java/org/opensearch/knn/index/IndexUtil.java	55.73% <ø> (ø)
...va/org/opensearch/knn/index/KNNCircuitBreaker.java	60.00% <0.00%> (ø)
.../main/java/org/opensearch/knn/index/KNNMethod.java	100.00% <ø> (ø)
...ava/org/opensearch/knn/index/KNNMethodContext.java	92.50% <ø> (ø)
...java/org/opensearch/knn/index/MethodComponent.java	88.88% <ø> (ø)
...g/opensearch/knn/index/MethodComponentContext.java	91.13% <ø> (ø)
...earch/knn/index/memory/NativeMemoryAllocation.java	82.92% <ø> (ø)
.../java/org/opensearch/knn/index/query/KNNQuery.java	83.33% <ø> (ø)
...org/opensearch/knn/index/query/KNNQueryResult.java	100.00% <ø> (ø)
... and 87 more

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