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From: Robert Muir <rcmuir@gmail.com>
Date: Thu, 3 Feb 2011 18:17:33 -0500
Message-ID: <AANLkTikL6XOZSSSK21WS6UXa3vj2Evw+fKhsycOpkgfp@mail.gmail.com>
Subject: Re: BooleanQuery / multiple indexes - Lucene 3.0.3
To: java-user@lucene.apache.org
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On Thu, Feb 3, 2011 at 5:57 PM, Phil Herold <pherold@d-wise.com> wrote:
> Hi,
>
>
>
> I'm getting incorrect search results when I use a MultiSearcher across
> multiple indexes with a Boolean query, specifically, foo AND !bar (using
> QueryParser). For example, with two indexes, I have a single document that
> satisfies both "foo" and "bar", so it should be excluded from the search
> result. It's not. If I do the search across the one index (using just
> IndexSearcher) containing the document in question, it excludes the document
> as expected. I've not been able to reproduce this with a simple test case,
> unfortunately. The indexes are large (10K documents), with MB worth of data.
>

Hi, yes this is a bug: https://issues.apache.org/jira/browse/LUCENE-2756

There are fixes to this in unreleased code, but in the meantime you
can use one of these workarounds:
1. queryParser.setMultiTermRewriteMethod(MultiTermQuery.CONSTANT_SCORE_FILTER_REWRITE)
2. using IndexSearcher over MultiReader instead of MultiSearcher.

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