In the page http://wiki.apache.org/solr/UpdateXmlMessages
We find: Optional attributes on "doc" * boost = <float> - default is 1.0 (See Lucene docs for definition of boost.) * NOTE: make sure norms are enabled (omitNorms="false" in the schema.xml) for any fields where the index-time boost should be stored. This NOTE appears to be block-copied from the following entry about field-level boosts, and makes no sense here. Lance Norskog