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https://issues.apache.org/jira/browse/SOLR-4586?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14195223#comment-14195223
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Shawn Heisey commented on SOLR-4586:
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[~reparker], maxBooleanClauses is a global Lucene setting across the entire
application, and the last thing to set that value will "win" every time.
If you have any configs with the default of 1024 and you reload any of those
cores after reloading the one that sets it to 2048, then it will be changed
back -- for the entire application. The best option is to set the higher limit
in *every* solrconfig.xml file, or remove the setting from all of them except
one.
The javadocs for the Lucene setter method do not indicate this global nature,
but I assure you that I have looked at the code, and it is indeed global.
http://lucene.apache.org/core/4_10_0/core/org/apache/lucene/search/BooleanQuery.html#setMaxClauseCount%28int%29
> Increase default maxBooleanClauses
> ----------------------------------
>
> Key: SOLR-4586
> URL: https://issues.apache.org/jira/browse/SOLR-4586
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 4.2
> Environment: 4.3-SNAPSHOT 1456767M - ncindex - 2013-03-15 13:11:50
> Reporter: Shawn Heisey
> Attachments: SOLR-4586.patch, SOLR-4586.patch, SOLR-4586.patch,
> SOLR-4586.patch, SOLR-4586.patch, SOLR-4586_verify_maxClauses.patch
>
>
> In the #solr IRC channel, I mentioned the maxBooleanClauses limitation to
> someone asking a question about queries. Mark Miller told me that
> maxBooleanClauses no longer applies, that the limitation was removed from
> Lucene sometime in the 3.x series. The config still shows up in the example
> even in the just-released 4.2.
> Checking through the source code, I found that the config option is parsed
> and the value stored in objects, but does not actually seem to be used by
> anything. I removed every trace of it that I could find, and all tests still
> pass.
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