As I was reviewing the boosting capabilities of the dismax & edismax query parsers, it's not clear to me that the "boost query" has much use. The value of boost functions, particularly with a multiplied boost that edismax supports, is very clear -- there are a variety of uses. But I can't think of a useful case when I want to both *add* a component to the ultimate score, and for that component to be a non-function query (i.e. use the lucene query parser).
Also, you can basically get the same affect as a boost query via boost functions: bf=query(mybq)&mybq=... and note you will probably multiply this via product(10,query(mybq)) to boost it to an appropriate number. ~ David Smiley
