Hi There have been several discussions in the past on how to do BM25F scoring in Solr. People have mentioned BlendedTermQuery and in Lucene 8.0 we got a new BM25FQuery.
What I mainly want is to normalize the doc freq (IDF) across fields, so that e.g. title field uses same doc-freq as body field. And ideally it should work in any query parser, including edismax. Have any of you succeeded in this, alternatively some other workaround achieving a normalized IDF across fields? An approximation could be to always use doc-freq from the largest field in the index, e.g. body, but not sure if you can do that in Similarity? -- Jan Høydahl, search solution architect Cominvent AS - www.cominvent.com
