I'm still on 0.20, so I haven't tried any of the new features in 0.90.
I am interested in how well BM25 performs, particularly with IDFs and
distributed shards. I am finding relevancy issues dealing with queries
over numerous shards returning few results. IDF is still a component of
BM25, I am just hoping the term scoring will be improved for our use case.
Never heard-of/used the other similarity models.
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