/**
  * Update the configuration for Solr. See $solr_options for a discussion of the accepted array keys
  * @param array $options - The options to update
  */
 static function configure_server($options = array())
 {
     self::$solr_options = array_merge(self::$solr_options, $options);
     self::$merged_solr_options = null;
     self::$service_singleton = null;
     self::$service_core_singletons = array();
 }