Use BoostAttribute in in TokenFilters to denote Terms that QueryParser should
give lower boosts
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Key: LUCENE-3130
URL: https://issues.apache.org/jira/browse/LUCENE-3130
Project: Lucene - Java
Issue Type: Improvement
Reporter: Hoss Man
A recent thread asked if there was anyway to use QueryTime synonyms such that
matches on the original term specified by the user would score higher then
matches on the synonym. It occurred to me later that a float Attribute could
be set by the SynonymFilter in such situations, and QueryParser could use that
float as a boost in the resulting Query. IThis would be fairly straightforward
for the simple "synonyms => BooleamQuery" case, but we'd have to decide how to
handle the case of synonyms with multiple terms that produce MTPQ, possibly
just punt for now)
Likewise, there may be other TokenFilters that "inject" artificial tokens at
query time where it also might make sense to have a reduced "boost" factor...
* SynonymFilter
* CommonGramsFilter
* WordDelimiterFilter
* etc...
In all of these cases, the amount of the "boost" could me configured, and for
back compact could default to "1.0" (or null to not set a boost at all)
Furthermore: if we add a new BoostAttrToPayloadAttrFilter that just copied the
boost attribute into the payload attribute, these same filters could give
"penalizing" payloads to terms when used at index time) could give "penalizing"
payloads to terms.
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