Despite the discussion in SOLR-3823/SOLR-3278, my experience with Solr 4.2 is that it does indeed allow negative boosts on both "bf" and "qf". I think the functionality was added under the radar possibly with SOLR-4093, not sure though. In disbelief, I did some testing and it seems to really work.
James Dyer Ingram Content Group (615) 213-4311 -----Original Message----- From: Jack Krupansky [mailto:j...@basetechnology.com] Sent: Thursday, May 09, 2013 5:41 PM To: solr-user@lucene.apache.org Subject: Re: Negative Boosting at Recent Versions of Solr? Solr does support both additive and multiplicative boosts. Although Solr doesn't support negative multiplicative boosts on query terms, it does support fractional multiplicative boosts (0.25) which do allow you to de-boost a term. The boosts for individual query terms and for the edismax "qf" parameter cannot be negative, but can be fractional. The edismax "bf" parameter give a function query that provides an additive boost, which could be negative. The edismax "boost" parameter gives a function query that provides a multiplicative boost - which could be negative, so it’s not absolutely true that doesn't support negative boosts. -- Jack Krupansky -----Original Message----- From: Furkan KAMACI Sent: Thursday, May 09, 2013 6:08 PM To: solr-user@lucene.apache.org Subject: Negative Boosting at Recent Versions of Solr? I know that whilst Lucene allows negative boosts, Solr does not. However did it change with newer versions of Solr (I use Solr 4.2.1) or still same?
