Julie Tibshirani created LUCENE-9823:
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Summary: SynonymQuery rewrite can change field boost calculation
Key: LUCENE-9823
URL: https://issues.apache.org/jira/browse/LUCENE-9823
Project: Lucene - Core
Issue Type: Bug
Reporter: Julie Tibshirani
SynonymQuery accepts a boost per term, which acts as a multiplier on the term
frequency in the document. When rewriting a SynonymQuery with a single term, we
create a BoostQuery wrapping a TermQuery. This changes the meaning of the
boost: it now multiplies the final TermQuery score instead of multiplying the
term frequency before it's passed to the score calculation.
This is a small point, but maybe it's worth avoiding rewriting a single-term
SynonymQuery unless the boost is 1.0.
The same consideration affects CombinedFieldQuery in sandbox.
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