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From "Jack Krupansky" <>
Subject Re: Negative Boosting at Recent Versions of Solr?
Date Thu, 09 May 2013 22:41:25 GMT
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
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? 

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