The BoostingQuery class can be used to effectively demote results that match a given query.
Unlike the "NOT" clause, this still selects documents that contain undesirable terms,
but reduces their overall score:
Query balancedQuery = new BoostingQuery(positiveQuery, negativeQuery, 0.01f);
In this scenario the positiveQuery contains the mandatory, desirable criteria which is used to
select all matching documents, and the negativeQuery contains the undesirable elements which
are simply used to lessen the scores. Documents that match the negativeQuery have their score
multiplied by the supplied "boost" parameter, so this should be less than 1 to achieve a
This code was originally made available here: [WWW] http://marc.theaimsgroup.com/?l=lucene-user&m=108058407130459&w=2
and is documented here: http://wiki.apache.org/lucene-java/CommunityContributions
Prints a query to a string, with field assumed to be the
default field and omitted.
The representation used is one that is supposed to be readable
by QueryParser. However,
there are the following limitations:
If the query was created by the parser, the printed
representation may not be exactly what was parsed. For example,
characters that need to be escaped will be represented without
the required backslash.
Some of the more complicated queries (e.g. span queries)
don't have a representation that can be parsed by QueryParser.