If you dont want to do a pure negative query and just want boost a few documents down based on a matching criteria try to use linear function (one of the functions available in boost function) with a negative m (slope). We could solve our problem this way.
We wanted to do negatively boost some documents based on certain keywords while Marc Sturlese wrote: > > > :>the only way to "negative boost" is to "positively boost" the inverse... > :> > :> (*:* -field1:value_to_penalize)^10 > > This will do the job aswell as bq supports pure negative queries (at least > in trunk): > bq=-field1:value_to_penalize^10 > > http://wiki.apache.org/solr/SolrRelevancyFAQ#head-76e53db8c5fd31133dc3566318d1aad2bb23e07e > > > hossman wrote: >> >> >> : Use decimal figure less than 1, e.g. 0.5, to express less importance. >> >> but that's stil la positive boost ... it still increases the scores of >> documents that match. >> >> the only way to "negative boost" is to "positively boost" the inverse... >> >> (*:* -field1:value_to_penalize)^10 >> >> : > 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 >> : > >> : > >> >> >> >> -Hoss >> >> >> > > -- View this message in context: http://www.nabble.com/Is-negative-boost-possible--tp25025775p25840621.html Sent from the Solr - User mailing list archive at Nabble.com.
