Elasticsearch按多个字段分组并求和小时数(聚合)

GET /events/_search
{
  "size": 0,
  "aggs": {
    "group_by_field1": {
      "terms": {
        "field": "group_by_field1"
      },
      "aggs": {
        "group_by_field2": {
          "terms": {
            "field": "group_by_field2"
          },
          "aggs": {
            "sum_hours": {
              "sum": {
                "field": "time_in_hours"
              }
            }
          }
        }
      }
    }
  }
}

{
  "aggregations": {
    "group_by_field1": {
      "buckets": [
        {
          "key": "value1",
          "doc_count": 10,
          "group_by_field2": {
            "buckets": [
              {
                "key": "valueA",
                "doc_count": 5,
                "sum_hours": {
                  "value": 12.5
                }
              },
              {
                "key": "valueB",
                "doc_count": 5,
                "sum_hours": {
                  "value": 7.5
                }
              }
            ]
          }
        },
        {
          "key": "value2",
          "doc_count": 5,
          "group_by_field2": {
            "buckets": [
              {
                "key": "valueA",
                "doc_count": 3,
                "sum_hours": {
                  "value": 4.5
                }
              },
              {
                "key": "valueB",
                "doc_count": 2,
                "sum_hours": {
                  "value": 3.0
                }
              }
            ]
          }
        }
      ]
    }
  }
}