def _from_dict(cls, _dict):
        """Initialize a AggregationResult object from a json dictionary."""
        args = {}
        if 'key' in _dict:
            args['key'] = _dict.get('key')
        if 'matching_results' in _dict:
            args['matching_results'] = _dict.get('matching_results')
        if 'aggregations' in _dict:
            args['aggregations'] = [
                QueryAggregation._from_dict(x)
                for x in (_dict.get('aggregations'))
            ]
        return cls(**args)
Initialize a AggregationResult object from a json dictionary.