问题-我想要计算嵌套数组MATCHES为空（如“MATCHES”）的文档数：[ ]。我的文档结构如下所示（为简单起见，显示了两条记录）-

{
  "hits": [
    {
      "_type": "_doc",
      "_id": "ef0a2c44179a513476b080cc2a585d95",
      "_source": {
        "DIVISION_NUMBER": 44,
        "MATCHES": [
          {
            "MATCH_STATUS": "APPROVED",
            "UPDATED_ON": 1599171303000
          }
        ]
      }
    },
    {
      "_type": "_doc",
      "_id": "ef0a2c44179a513476b080cc2a585d95",
      "_source": {
        "DIVISION_NUMBER": 44,
        "MATCHES": [ ]
      }
    }
  ]
}

已尝试解决方案-我尝试了以下不同的聚合方法（解决方法）（empty-match-agg 1、empty-match-agg 2...），但这些方法都没有给出正确的结果。请帮助！

"aggs": {
    "sku": {
      "nested": {
        "path": "MATCHES"
      },
      "aggs": {
        "empty-match-agg1": {
          "missing": {
            "field": "MATCHES"
          }
        },
        "empty-match-agg2": {
          "terms": {
            "field": "MATCHES",
            "missing": "N/A"
          }
        },
        "empty-match-agg3": {
          "sum": {
            "script": {
              "lang": "painless",
              "source": "params['_source'].MATCHES"
            }
          }
        },
        "empty-match-agg4": {
          "filter": {
            "bool": {
              "must_not": {
                "nested": {
                  "query": {
                    "match_all": {}
                  },
                  "path": "MATCHES"
                }
              }
            }
          }
        },
        "empty-match-agg5": {
          "terms": {
            "field": "MATCHES"
          }
        }
      }
    }
  }