src/ElasticSearch/DSL/Stringify.php
protected function transformDSLSortToString($dslSort) {
        $string = "";
        if (is_array($dslSort)) {
            foreach ($dslSort as $sort) {
                if (is_array($sort)) {
                    $field = key($sort);
                    $info = current($sort);
                }
                else
                    $field = $sort;
                $string .= "&sort=" . $field;
                if (isset($info)) {
                    if (is_string($info) && $info == "desc")
                        $string .= ":reverse";
                    elseif (is_array($info) && array_key_exists("reverse", $info) && $info['reverse'])
                        $string .= ":reverse";
                }
            }
        }
        return $string;
    }
protected function transformDSLSortToString($dslSort) {
        $string = "";
        if (is_array($dslSort)) {
            foreach ($dslSort as $sort) {
                if (is_array($sort)) {
                    $field = key($sort);
                    $info = current($sort);
                }
                else
                    $field = $sort;
                $string .= "&sort=" . $field;
                if (isset($info)) {
                    if (is_string($info) && $info == "desc")
                        $string .= ":reverse";
                    elseif (is_array($info) && array_key_exists("reverse", $info) && $info['reverse'])
                        $string .= ":reverse";
                }
            }
        }
        return $string;
    }
Transform search parameters to string

@return string
@param mixed $dslSort