GET /employees/_search
{
   "size" : 0,
   "aggs": {
      "locations": {
         "terms": {
            "field": "location"
         },
         "aggs": {
            "sex": {
                "terms": {
                    "field": "sex"
                },
                "aggs": {
                    "age_ranges": {
                        "field": "age",
                        "ranges" : [
                            { "to" : 20 },
                            { "from" : 20, "to" : 40 },
                            { "from" : 40 }
                        ],
                       "aggs": {
                          "avg_salary": {
                              "avg": {
                                 "field": "salary"
                              }
                          }
                       }
                    }
                }
            }
         }
      }
   }
}