public function getSpecifications(array $options = [])
    {
        $data = [
            'index' => $this->index,
            'collection' => $this->collection
        ];

        $response = $this->kuzzle->query(
            $this->buildQueryArgs('collection', 'getSpecifications'),
            $this->kuzzle->addHeaders($data, $this->headers),
            $options
        );

        return $response['result'];
    }