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https://issues.apache.org/jira/browse/SOLR-4646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620879#comment-13620879
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Jan Høydahl commented on SOLR-4646:
-----------------------------------
That's what luceneMatchVersion is for - if you upgrade solr.war without bumbing
version in solrconfig, you get the "old" behavior. If you start from scratch or
migrate your config bumping luceneMatchVersion, you do a conscious choice, and
can adjust according to CHANGES.TXT.
Thus if the community feels this is a bad default we should not be afraid to
rectify that now. Google.com enforces uppercase operators - probably because of
user confusion and wrong results with lowercase - so why should we set the bar
lower?
+1 to change the default from true to false (don't care which version, 4.3 or
5.0)
This issue also touches SOLR-3580 which proposes to replace the
lowercaseOperators param with a more flexible variant.
> lowercaseOperators is enabled by default for edismax query parser
> -----------------------------------------------------------------
>
> Key: SOLR-4646
> URL: https://issues.apache.org/jira/browse/SOLR-4646
> Project: Solr
> Issue Type: Bug
> Components: query parsers
> Affects Versions: 4.1, 4.2
> Reporter: Alexander Koval
>
> [Documentation|http://wiki.apache.org/solr/ExtendedDisMax#lowercaseOperators]
> says:
> *lowercaseOperators*
> This param controls whether to try to interpret lowercase words as boolean
> operators such as "and", "not" and "or". Set {{&lowercaseOperators=true}} to
> allow this. Default is {{"*false*"}}.
> But in fact {{lowercaseOperators=true}} by default.
> And if one of boolean operators in lowercase is present in query it turns off
> {{mm}} parameter:
> * {{q=Young+6+or+Ariston&defType=edismax&qf=name&mm=100%25&debugQuery=true}}
> {{"parsedquery_toString": "+((name:young) (name:6) (name:ariston))"}}
> *
> {{q=Young+6+or+Ariston&defType=edismax&qf=name&mm=100%25&lowercaseOperators=false&debugQuery=true}}
> {{"parsedquery_toString": "+(((name:young) (name:6) (name:ariston))~3)"}}
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