(PECL solr >= 2.2.0) Enable/Disable result grouping (group parameter)

(PECL solr >= 0.9.2) Returns whether or not stats is enabled

(PECL solr >= 0.9.2) Specifies how to sort the returned terms

(PECL solr >= 0.9.2) Returns the maximum number of characters of the field to return

(PECL solr >= 2.2.0) Returns the expand query expand.q parameter

(PECL solr >= 2.2.0) Returns the group.sort value

(PECL solr >= 0.9.2) Removes one of the stats.facet parameters

(PECL solr >= 2.2.0) Returns an array of fields

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

(PECL solr >= 0.9.2) Sets the minimum document frequency used for determining term count