Lance Norskog created LUCENE-4232:
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Summary: edismax, synonyms and mm=100%
Key: LUCENE-4232
URL: https://issues.apache.org/jira/browse/LUCENE-4232
Project: Lucene - Java
Issue Type: Bug
Reporter: Lance Norskog
Priority: Minor
There is a problem with query-side synonyms, edismax and must-match=100%.
edismax interprets must-match=100% as "number of terms found by edismax from
the original query". These terms go through the query analyzer, and the synonym
filter creates more terms, *but* the must-match term count is not incremented.
Thus, given a synonym of
{code}
monkeyhouse => monkey house
{code}
the query {{q=big+monkeyhouse&mm=100%}} becomes (effectively)
{{q=big+monkey+house&mm=2}}. This query finds documents matching only two out
of three terms {{big+monkey, monkey+house, big+house}}.
This might also be a problem in dismax.
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