(PECL solr >= 0.9.2) Maps to mlt.qf public

(PECL solr >= 0.9.2) Returns all the facet queries

(PECL solr >= 2.2.0) Returns true if grouping is enabled

(PECL solr >= 2.2.0) Specifies the number of results to return for each group. The server default value is

(PECL solr >= 0.9.2) Maps to facet.mincount

(PECL solr >= 2.2.0) Sets group.facet parameter

(PECL solr >= 2.2.0) Add a field to be used to group results.

(PECL solr >= 0.9.2) Returns the highlight field to use as backup or default

(PECL solr >= 2.2.0) If true, facet counts are based on the most relevant document of each group matching

(PECL solr >= 2.2.0) Sets the group.offset parameter.