Sleimanx2\Plastic\DSL\SearchBuilder::sortBy PHP 메소드

    public function sortBy($fields, $order = null, array $parameters = [])
    {
        $fields = is_array($fields) ? $fields : [$fields];
        foreach ($fields as $field) {
            $sort = new FieldSort($field, $order, $parameters);
            $this->query->addSort($sort);
        }
        return $this;
    }