protected function _getFilterList($params)
 {
     if (isset($params[static::PAGING_COUNT_PARAM])) {
         unset($params[static::PAGING_COUNT_PARAM]);
     }
     if (isset($params[static::PAGING_PAGE_PARAM])) {
         unset($params[static::PAGING_PAGE_PARAM]);
     }
     if (isset($params[static::REQUEST_FIELDS_PARAM])) {
         unset($params[static::REQUEST_FIELDS_PARAM]);
     }
     if (isset($params[static::REQUEST_SKIP_EMPTY_ITEMS_PARAM])) {
         unset($params[static::REQUEST_SKIP_EMPTY_ITEMS_PARAM]);
     }
     if (isset($params[static::OUTPUT_PARAM])) {
         unset($params[static::OUTPUT_PARAM]);
     }
     return $this->_service->buildFilterList($params);
 }