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The "SolrRelevancyFAQ" page has been changed by HossMan: http://wiki.apache.org/solr/SolrRelevancyFAQ?action=diff&rev1=24&rev2=25 Comment: elaborate on boosting documents, mention ExternalFileField {{{q="batman movie"&qs=100}}} == How can I increase the score for specific documents == + + === Query Elevation Component === + To raise certain documents to the top of the result list based on a certain query, one can use the QueryElevationComponent. + === index-time boosts === To increase the scores for certain documents that match a query, regardless of what that query may be, one can use index-time boosts. @@ -89, +93 @@ Be aware that all index-time boosts end up being encoded into a single byte using [[http://lucene.apache.org/core/old_versioned_docs/versions/3_5_0/api/core/org/apache/lucene/search/Similarity.html#encodeNormValue%28float%29|Similarity.encodeNormValue]], which uses a 3-bit mantissa. So differences in boost values of less than 25% may end up being rounded out. - === Query Elevation Component === - To raise certain documents to the top of the result list based on a certain query, one can use the QueryElevationComponent. + === Field Based Boosting === + + You can structure your queries to include "boosts" based on specific attributes of documents. This might be a simple matter of adding an optional query clause that "boosts" documents for matching an "important:true" query, or by using a function on the value of a numeric field (see the next section) == How can I change the score of a document based on the *value* of a field (say, "popularity") == Use a FunctionQuery as part of your query. @@ -101, +106 @@ {{{ # simple boosts by popularity - q=%2Bsupervillians+_val_:"popularity" + defType=lucene&df=text&q=%2Bsupervillians+_val_:"popularity" defType=dismax&qf=text&q=supervillians&bf=popularity + q={!boost b=popularity}text:supervillians # boosts based on complex functions of the popularity field - q=%2Bsupervillians+_val_:"scale(popularity,0,100)" + defType=lucene&q=%2Bsupervillians+_val_:"sqrt(popularity)" defType=dismax&qf=text&q=supervillians&bf=sqrt(popularity) + q={!boost b=sqrt(popularity)}text:supervillians }}} + + These functions can also operate on an [[http://lucene.apache.org/solr/api/org/apache/solr/schema/ExternalFileField.html|ExternalFileField]] + == How are documents scored == Basic scoring factors:
