As far as i know, SweetSpotSimilarty needs be configured. I did use it once but wrapped a factory around it to configure the sweet spot. It worked just as expected and explained in that paper about the subject.
If you use a custom similarity that , for example, caps tf to 1. Does it then work? > Hi all, > > I'm having trouble getting the basic similarity example to work. If you > notice at the bottom of the schema.xml file, there is a line there that is > commented out: > > <!-- <similarity class="org.apache.lucene.search.DefaultSimilarity"/> --> > > I uncomment that line and replace it with the following: > > <similarity class="org.apache.lucene.misc.SweetSpotSimilarity"/> > > Which comes natively with lucene. However, the scores before and after > making this change are the same. I did a full import both times but that > didn't seem to help. > > I ran svn up on both my solr directory and my lucene directory. Actually, > my lucene directory was not previously under svn so I removed everything > in there and did svn co > http://svn.apache.org/repos/asf/lucene/dev/trunk/lucene/ > > So why isn't my installation taking the SweetSpot Similarity change? > > Thanks, > > Brian Lamb
