def export_to_storage_bucket(self, bucket, namespace=None, entity_filter=None, labels=None):
        """
        
        """
        admin_conn = self.get_conn()

        output_uri_prefix = 'gs://' + '/'.join(filter(None, [bucket, namespace]))
        if not entity_filter:
            entity_filter = {}
        if not labels:
            labels = {}
        body = {
            'outputUrlPrefix': output_uri_prefix,
            'entityFilter': entity_filter,
            'labels': labels,
        }
        resp = (admin_conn
                .projects()
                .export(projectId=self.project_id, body=body)
                .execute(num_retries=self.num_retries))

        return resp