(PECL solr >= 2.2.0) Enable/Disable result grouping (group parameter)
(PECL solr >= 2.2.0) Removes an expand filter query
(PECL solr >= 2.2.0) Overrides main filter query, determines which documents to include in the main group
(PECL solr >= 2.2.0) Returns group cache percent value
(PECL solr >= 0.9.2) Returns the text snippet generator for highlighted text
(PECL solr >= 0.9.2) Sets the frequency below which terms will be ignored in the source docs
(PECL solr >= 0.9.2) Toggles the echoHandler parameter
(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) Flag to show debug information
(PECL solr >= 2.2.0) If true, Solr includes the number of groups that have matched the query in the results
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