elasticsearch geo queries

geoquery.json

{
        "query" : {
            "match_all" : {}
        },
        "filter" : {
            "geo_distance" : {
                "distance" : "50km",
                "location" : [-33.9, 151.175]
            }
        },
        "sort" : [
        {
            "_geo_distance" : {
                "location" : [-33.9, 151.175],
                "order" : "asc",
                "unit" : "km"
            }
        }
    ]        
}