(PECL solr >= 2.2.0) Allows grouping results based on the unique values of a function query (group.func parameter)

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

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

(PECL solr >= 0.9.2) Returns the maximum number of constraint counts that should be returned for the facet

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

(PECL solr >= 0.9.2) Sets the maximum document frequency

(PECL solr >= 0.9.2) Sets the mltMinDoc frequency

(PECL solr >= 0.9.2) Specifies the maximum number of tokens to parse

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

(PECL solr >= 0.9.2) Returns the maximum number of tokens to parse in each document field that is not stored