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https://issues.apache.org/jira/browse/SOLR-3580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402321#comment-13402321
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Yonik Seeley commented on SOLR-3580:
------------------------------------

edismax is about heuristics and sometimes guessing user intent... if 
exact/strict syntax is desired, the lucene query parser is a better fit.
                
> In ExtendedDismax, lowercase 'not' operator is not being treated as an 
> operator when 'lowercaseOperators' is enabled
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-3580
>                 URL: https://issues.apache.org/jira/browse/SOLR-3580
>             Project: Solr
>          Issue Type: Bug
>          Components: query parsers
>    Affects Versions: 4.0
>            Reporter: Michael Dodsworth
>            Priority: Minor
>             Fix For: 4.0
>
>         Attachments: SOLR-3580.patch
>
>
> When lowercase operator support is enabled (for edismax), the lowercase 'not' 
> operator is being wrongly treated as a literal term (and not as an operator).

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