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https://issues.apache.org/jira/browse/SOLR-3085?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197854#comment-13197854
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Jan Høydahl commented on SOLR-3085:
-----------------------------------
In this thread http://search-lucene.com/m/Tzktd1a95jx James Dyer suggests:
bq. I do wonder...what if (e)dismax had a flag you could set that would tell it
that if any analyzers removed a term, then that term would become optional for
any fields for which it remained? I'm not sure what the development effort
would perhaps it would be a nice way to circumvent this problem in a future
release...
I like the suggestion. Would this be possible?
Take as example this parsed query (q=the contract&qf=alltags
title_en&mm=100%defType=edismax)
{noformat}
+((DisjunctionMaxQuery((alltags:the)~0.01)
DisjunctionMaxQuery((title_en:contract | alltags:contract)~0.01))~2)
{noformat}
The field "alltags" does not use stopwords, but "title_en" does. So we get a
required DisMax Query for alltags:the which does not match any docs. Is it
possible in the (e)DisMax code to detect this and make the first DisMax query
optional?
> 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: search
> Reporter: Jan Høydahl
> Labels: MinimumShouldMatch, dismax, stopwords
> Fix For: 3.6, 4.0
>
>
> 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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