You can use omitNorms="true" for any given field. Length normalization will be disabled and index-time boosting will not be available any more.
TermFrequencies can also be disabled by setting omitTermFreqAndPositions="true" for any given field. Omitting TF can be very useful if you need an easy way to prevent spam documents from hijacking the score (if you sort on score of course). http://wiki.apache.org/solr/SchemaXml On Monday 14 March 2011 15:39:47 Jonathan Rochkind wrote: > On 3/13/2011 6:24 PM, Ahmet Arslan wrote: > > http://lucene.apache.org/java/2_9_1/api/core/org/apache/lucene/search/Sim > > ilarity.html#formula_norm > > > > I can see that the one with 5 matches is longer than the other. Shorter > > documents are favored in solr/lucene with length normalization factor. > > Is there any easy way to turn this off for a given field? That is, I > think, to still have the iDF be used, but not the TF. Maybe that's it. > but anyway, to turn off document length normalization, but only for a > certain field? > > I'm not sure if that's what useNorms does, or if useNorms does _more_ > than this, including some things I wouldn't want, or if there is some > other parameter that would do this instead? > > Thanks for any advice, > > Jonathan -- Markus Jelsma - CTO - Openindex http://www.linkedin.com/in/markus17 050-8536620 / 06-50258350
