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Date: Tue, 18 Aug 2009 10:01:33 -0400
Message-ID: <a016e7330908180701o3bc74ad5xd5f21c0dca1157b5@mail.gmail.com>
Subject: Is negative boost possible?
From: Larry He <shiquanhe@gmail.com>
To: solr-user@lucene.apache.org
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Hi all,

I am looking for a way to assign negative boost to a term in Solr query.
Our use scenario is that we want to boost matching documents that are
updated recently and penalize those that have not been updated for a long
time.  There are other terms in the query that would affect the scores as
well.  For example we construct a query similar to this:

*:* field1:value1^2  field2:value2^2 lastUpdateTime:[NOW/DAY-90DAYS TO *]^5
lastUpdateTime:[* TO NOW/DAY-365DAYS]^-3

I notice it's not possible to simply use a negative boosting factor in the
query.  Is there any way to achieve such result?

Regards,
Shi Quan He

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