TopTermsBlendedFreqScoringRewrite

A rewrite method that first translates each term into BooleanClause.Occur.SHOULD clause in a BooleanQuery, but adjusts the frequencies used for scoring to be blended across the terms, otherwise the rarest term typically ranks highest (often not useful eg in the set of expanded terms in a FuzzyQuery).

This rewrite method only uses the top scoring terms so it will not overflow the boolean max clause count.