Fix BM25 score for PhraseDocIterator #2404
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What problem does this PR solve?
Update IDF formula for PhraseDocIterator
reference: https://lucene.apache.org/core/10_1_0/core/org/apache/lucene/search/similarities/BM25Similarity.html#idfExplain(org.apache.lucene.search.CollectionStatistics,org.apache.lucene.search.TermStatistics[])
Issue link:#1320
Type of change