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https://issues.apache.org/jira/browse/SOLR-3931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13492300#comment-13492300
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Joel Nothman commented on SOLR-3931:
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Version 4.0.0 allows the specification of a custom similarity factory for each
field in schema.xml (see SOLR-2338; it seems documentation is a bit lacking).
So these options are not per-query, but per-core.
It would be possible to copy or patch Lucene's {{DefaultSimilarity}} and Solr's
{{DefaultSimilarityFactory}} to take `useCoord` and `useQueryNorm` parameters.
> Turn off coord() factor for scoring
> -----------------------------------
>
> Key: SOLR-3931
> URL: https://issues.apache.org/jira/browse/SOLR-3931
> Project: Solr
> Issue Type: Bug
> Affects Versions: 4.0
> Reporter: Bill Bell
>
> We would like to remove coordination factor from scoring.
> FOr small fields (like name of doctor), we want to not score higher if the
> same term is in the field more than once. Makes sense for books, not so much
> for formal names.
> /solr/select?q=*:*&coordFactor=false
> Default is true.
> (Note: we might want to make each of these optional - tf, idf, coord,
> queryNorm
> coord(q,d) is a score factor based on how many of the query terms are found
> in the specified document. Typically, a document that contains more of the
> query's terms will receive a higher score than another document with fewer
> query terms. This is a search time factor computed in coord(q,d) by the
> Similarity in effect at search time.
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