groupby elasticsearch

GET usertag/usertag/_search
{
    "query": {
        "match": {
            "tagname": "春节"
        }
    },
    "size": 0,
    "aggs": {
        "myname1": {
            "terms": {
                "field": "id.keyword"
            },
            "aggs": {
                "myname2": {
                    "terms": {
                        "field": "username.keyword"
                    }
                }
            }
        }
    }
}