Support customizable BM25 score parameters in fulltext search #2410
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What problem does this PR solve?
Support customizable BM25 score parameters, including:
k1,bfor BM25 score (default value:k1= 1.2,b= 0.75)deltafor BM25+ score (default value:delta= 0.0)deltavalue for term and phrasereference: https://en.wikipedia.org/wiki/Okapi_BM25
Type of change