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https://issues.apache.org/jira/browse/LUCENE-4378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13453582#comment-13453582
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Robert Muir commented on LUCENE-4378:
-------------------------------------
As I said before, I just don't agree.
I don't think it would be good to add to the grammar: its significantly trappy
and I can't think of any actual use cases,
instead lots of confusion where people really want a small boost instead of a
negative one.
So I think its a good thing that its not supported and throws an exception (and
documented as such in the syntax today).
> 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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