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https://issues.apache.org/jira/browse/LUCENE-4378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453576#comment-13453576
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Hoss Man commented on LUCENE-4378:
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bq. I don't agree with this. Negative boosts to terms are generally
undesirable, this is really esoteric and trappy.
i agree with you somewhat, but it is a disconnect between what is possible in
the Query objects, and what the parses allows so i opened an issue.
in some cases it is actually desirable, and somewhat straight forward to use
when programaticly combined with other Query objects, so we should consider
adding it, or at least adding an option for it that doesn't involve editing the
grammer -- ie: perhaps allow it in the grammer(s), but then make the java code
reject it in a way that people can override in subclasses?
> QueryParsers do not support negative boosts
> -------------------------------------------
>
> Key: LUCENE-4378
> URL: https://issues.apache.org/jira/browse/LUCENE-4378
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Hoss Man
> Attachments: LUCENE-4378-test.patch
>
>
> Negative query boosts have been supported at the "Query" object level for a
> long time (resulting in negative scores for matching documents), but
> evidently we never updated the QueryParsers to know about this - attempting
> to specify a negative boost in the query string results in a parse error.
> we should probably add this to the parser grammer(s)
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