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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Thu, 22 Oct 2009 14:26:24 -0000
Message-ID: <20091022142624.28277.77773@eos.apache.org>
Subject: 
 =?utf-8?q?=5BSolr_Wiki=5D_Update_of_=22SolrRelevancyFAQ=22_by_YonikSeeley?=

Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for chan=
ge notification.

The "SolrRelevancyFAQ" page has been changed by YonikSeeley.
The comment on this change is: add reference to QuertyElevation , move func=
tion next to index-boosting since it's related.
http://wiki.apache.org/solr/SolrRelevancyFAQ?action=3Ddiff&rev1=3D14&rev2=
=3D15

--------------------------------------------------

  =

  =

  =3D=3D How can I increase the score for specific documents =3D=3D
+ =3D=3D=3D index-time boosts =3D=3D=3D
  To increase the scores for certain documents that match a query, regardle=
ss of what that query may be, one can use index-time boosts.
  =

  Index-time boosts can be specified per-field also, so only queries matchi=
ng on that specific field will get the extra boost.  An Index-time boost on=
 a value of a multiValued field applies to all values for that field.
  =

- Index-time boosts are assigned with the optional attribute "boost" in the=
 <doc> section of the XML updating messages. See UpdateXmlMessages for more=
 informations.
+ Index-time boosts are assigned with the optional attribute "boost" in the=
 <doc> section of the XML updating messages. See UpdateXmlMessages for more=
 information.
  =

+ =3D=3D=3D Query Elevation Component =3D=3D=3D
+ To raise certain documents to the top of the result list based on a certa=
in queries, one can use the QueryElevationComponent.
+ =

+ =3D=3D How can I change the score of a document based on the *value* of a=
 field (say, "popularity") =3D=3D
+ Use a FunctionQuery as part of your query.
+ =

+ Solr can parse function queries in the following [[http://lucene.apache.o=
rg/solr/api/org/apache/solr/search/QueryParsing.html#parseFunction(java.lan=
g.String,%20org.apache.solr.schema.IndexSchema)|syntax]].
+ =

+ Some examples...
+ {{{
+   # simple boosts by popularity
+   q=3D%2Bsupervillians+_val_:"popularity"
+   defType=3Ddismax&qf=3Dtext&q=3Dsupervillians&bf=3Dpopularity
+ =

+   # boosts based on complex functions of the popularity field
+   q=3D%2Bsupervillians+_val_:"scale(popularity,0,100)"
+   defType=3Ddismax&qf=3Dtext&q=3Dsupervillians&bf=3Dsqrt(popularity)
+ }}}
  =

  =3D=3D How are documents scored =3D=3D
  Basic scoring factors:
@@ -161, +180 @@

  =

  Now you should be able to examine the scoring explain info of the top mat=
ching documents, compare it to the explain info for documents matching id:j=
uggernaut, and determine why the rankings are not as you expect.
  =

- =3D=3D How can I change the score of a document based on the *value* of a=
 field (say, "popularity") =3D=3D
- Use a FunctionQuery as a component of your query.
- =

- Solr can parse function queries in the following [[http://lucene.apache.o=
rg/solr/api/org/apache/solr/search/QueryParsing.html#parseFunction(java.lan=
g.String,%20org.apache.solr.schema.IndexSchema)|syntax]].
- =

- Some examples...
- {{{
-   # simple boosts by popularity
-   q=3D%2Bsupervillians+_val_:"popularity"
-   defType=3Ddismax&qf=3Dtext&q=3Dsupervillians&bf=3Dpopularity
- =

-   # boosts based on complex functions of the popularity field
-   q=3D%2Bsupervillians+_val_:"scale(popularity,0,100)"
-   defType=3Ddismax&qf=3Dtext&q=3Dsupervillians&bf=3Dsqrt(popularity)
- }}}
- =

  =

  =3D=3D How can I boost the score of newer documents =3D=3D
    * Do an explicit sort by date (relevancy scores are ignored)