java - 对 Array 的每个索引进行 ES 聚合

Question

我有一个具有以下值的索引，我需要对答案数组的每个索引执行聚合。以下是我的 ES 索引中存在的数据

[
  {
    "answers": [
      {
        "value": "statement1"
      },
      {
        "value": "statement2"
      },
      {
        "value": "statement3"
      }
    ]
  },
  {
    "answers": [
      {
        "value": "statement2"
      },
      {
        "value": "statement1"
      },
      {
        "value": "statement3"
      }
    ]
  }
]

我需要知道特定索引处不同值的计数， 这意味着我需要有关数组每个位置的响应计数的信息因此我需要聚合 aa 如下

{
  "took": 3,
  "timed_out": false,
  "_shards": {
    "total": 1,
    "successful": 1,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 9,
      "relation": "eq"
    },
    "max_score": null,
    "hits": []
  },
  "aggregations": {
    "Nest": {
      "doc_count": 2,
      "answers": {
        "doc_count_error_upper_bound": 0,
        "sum_other_doc_count": 0,
        "buckets": [
          {
            "key": "index0",
            "doc_count": 4,
            "statement1": 1,
            "statement2": 1,
            "statement3": 0
          },
          {
            "key": "index1",
            "doc_count": 4,
            "statement1": 1,
            "statement2": 1,
            "statement3": 0
          },
          {
            "key": "index2",
            "doc_count": 2,
            "statement1": 0,
            "statement2": 0,
            "statement3": 1
          }
        ]
      }
    }
  }
}