Pulkit Gupta

Use SPI instead of Enum for VectorSimilarityFunctions

11

### Description This PR is to get feedback on the idea and any major changes required in the commit. In this commit we are using Java SPI instead of ENUM...

Reuse BitSet when there are deleted documents in the index instead of creating new BitSet

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### Description Fixes issue: #12414 Before this change we were creating new BitSet every time when there are deletions in the index with use of matched Docs and Live Docs,...

Enforce fallback support for float vector retrieval in quantized KNN vector formats

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### Description In PR #14792, we added fallback support to Lucene99ScalarQuantizedVectorReader to retrieve float vectors when full-precision vectors are not present in the index. However, this fallback support was removed...