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https://issues.apache.org/jira/browse/SOLR-5198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754595#comment-13754595
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Markus Jelsma commented on SOLR-5198:
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If you need BM25Similarity to be the DEFAULT instead of TFIDFSimilarity, you
will have to provide your own SchemaSimilarityFactory just like Robert sais,
and let it return your preferred Similarity instead. Check line 48:
http://svn.apache.org/viewvc/lucene/dev/trunk/solr/core/src/java/org/apache/solr/search/similarities/SchemaSimilarityFactory.java?view=markup
> Make default similarty configurable
> -----------------------------------
>
> Key: SOLR-5198
> URL: https://issues.apache.org/jira/browse/SOLR-5198
> Project: Solr
> Issue Type: Improvement
> Components: Schema and Analysis
> Affects Versions: 4.4
> Reporter: HeXin
> Priority: Minor
> Fix For: 4.5, 5.0
>
>
> Though the code has supported for customizing scoring on a per-field basis
> in using <similarity/> in a schema's fieldType and
> we can configure our custom similarity factory in schema, we can't configure
> the default similarty and it is hardcode in SchemaSimilarityFactory.
> If we want to use another similarity as default similarty instead of
> DefaultSimilarity provided by lucene, we must to write another similarity
> factory to do this. Therefore, it is necessary to make default similarty
> configurable.
> Any comments is welcomed.
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