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https://issues.apache.org/jira/browse/SOLR-5198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13754271#comment-13754271
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Shawn Heisey commented on SOLR-5198:
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I am using BM25 without any custom code. Here's the top of my schema.xml:
{noformat}
<schema name="ncdat" version="1.5">
<similarity class="solr.BM25SimilarityFactory"/>
{noformat}
> 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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