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https://issues.apache.org/jira/browse/SOLR-3085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jan Høydahl updated SOLR-3085:
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Attachment: SOLR-3085.patch
This patch is a first shot at a new param {{mm.autoRelax}}
When set as {{&mm.autoRelax=true}} on the request, it will adjust
minShouldMatch to at most require the number of clauses with the max number of
disjuncts.
Have tested manually for some common cases, and it seems to work as expected,
i.e. if you had a query {{q=A horse in a stable}} that gave problems due to
mm=100% => minShouldMatch=5, applying autoRelax will adjust it to 2. Need to
add some JUnit tests.
> Fix the dismax/edismax stopwords mm issue
> -----------------------------------------
>
> Key: SOLR-3085
> URL: https://issues.apache.org/jira/browse/SOLR-3085
> Project: Solr
> Issue Type: Bug
> Components: query parsers
> Reporter: Jan Høydahl
> Labels: MinimumShouldMatch, dismax, stopwords
> Attachments: SOLR-3085.patch
>
>
> As discussed here http://search-lucene.com/m/Wr7iz1a95jx and here
> http://search-lucene.com/m/Yne042qEyCq1 and here
> http://search-lucene.com/m/RfAp82nSsla DisMax has an issue with stopwords if
> not all fields used in QF have exactly same stopword lists.
> Typical solution is to not use stopwords or harmonize stopword lists across
> all fields in your QF, or relax the MM to a lower percentag. Sometimes these
> are not acceptable workarounds, and we should find a better solution.
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