: a per field basis. I understand BM25 similarity is now supported in Solr
BM25 has been supported for a while, the major change recently is that it is now the underlying default in Solr 6. : but I was hoping to be able to configure k1 and b for different fields such : as title, description, anchor etc, as they are structured documents. What you can do in Solr is configured idff Similarity instances on a per-fieldType basis -- but you can have as many fieldTypes in your schema as you want, so you could have one type used just by your title field, and a diff type used just by your description field, etc... : Current Solr Version 5.4.1 You can download the solr refrence guide for 5.4 from here... http://archive.apache.org/dist/lucene/solr/ref-guide/ You'll want to search for Similarity and in particularly "SchemaSimilarityFactory" which (in 5.4) you'll have to configure explicitly in order to use diff BM25Similarity instances for each fieldType. In 6.0, SchemaSimilarityFactory is the global default, with BM25 as the per-field default... The current (draft) guide for 6.0 (not yet released) has info on that... https://cwiki.apache.org/confluence/display/solr/Other+Schema+Elements -Hoss http://www.lucidworks.com/
