(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) Returns true if grouping is enabled

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

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

(PECL solr >= 0.9.2) Retrieves the current boost value for the document

(PECL solr >= 0.9.2) Custom serialization of SolrDocument objects

(PECL solr >= 0.9.2) Moves the internal pointer to the next field