def get_all(self):
        """
        Returns a list of all visualizations
        :return: list of the Visualization instances
        """
        res = self.es.search(index=self.index, doc_type=self.doc_type, body={'query': {'match_all': {}}})
        if not res['hits']['total']:
            return []
        return [Visualization.from_kibana(hit) for hit in res['hits']['hits']]
Returns a list of all visualizations
        :return: list of the Visualization instances