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https://issues.apache.org/jira/browse/SOLR-5198?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13752433#comment-13752433
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Robert Muir commented on SOLR-5198:
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This isnt really true.
If you want to use a different default similarity, use that instead of
schemasimilarityfactory.
if you want to do per-field support and do things differently, just make your
own core-aware similarityfactory (schemasimilarity is not special, its just an
example we provide).
There are too many possibilities for things people want to do and too many
traps. Plugging in your own for expert stuff is really the way to go here.
> 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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