Add constructor arguments to GeoHashGridAggregation.
Add constructor arguments to GeoHashGridAggregation.

saimaz/ElasticsearchDSL,asev/ElasticsearchDSL,tadcka/ElasticsearchDSL,mansimas/ElasticsearchDSL,ongr-io/ElasticsearchDSL,abhiesa-tolexo/ElasticsearchDSL