Elasticsearch Date直方图聚合而不考虑年份

如何解决Elasticsearch Date直方图聚合而不考虑年份

我想汇总有关月份和日期的数据，我正在尝试进行日期直方图汇总，但考虑了完整的日期对象。

我有类似的数据：

      {
          "created" : "2020-09-26","id" : 6,"name" : "Halum khamu"      
      },{
          "created" : "2021-09-26","id" : 7,"name" : "new new"
      },{
          "created" : "2020-10-07","id" : 8,"name" : "Halum new"
      }

我正在使用此查询：

GET /regulations/_search/
{
  "aggs": {
    "news_over_time": {
      "date_histogram": {
        "field": "created","calendar_interval": "day","keyed": true,"format": "yyy-MM-dd","min_doc_count": 1
      }
    }
  }
}

它为我返回数据：

      "buckets" : {
        "2020-09-26" : {
          "key_as_string" : "2020-09-26","key" : 1600300800000,"doc_count" : 1
        },"2021-09-26" : {
          "key_as_string" : "2021-09-26","key" : 1601337600000,"2020-10-07" : {
          "key_as_string" : "2020-10-07","key" : 1632873600000,"doc_count" : 1
        }
      }

但是我的预期产量将不考虑年份：

      "buckets" : {
        "09-26" : {
          "key_as_string" : "09-26","doc_count" : 2
        },"10-07" : {
          "key_as_string" : "10-07","doc_count" : 1
        }
      }

我该怎么做？

解决方法

没有直接的方法可以解决此问题，但这应该可以完成工作：

GET regulations/_search
{
  "size": 0,"aggs": {
    "day_histogram": {
      "scripted_metric": {
        "init_script": "state.day_map = [:];","map_script": """
          def created = doc.created.value;
          
          def month = created.getMonthOfYear();
          def day = created.getDayOfMonth();
          
          def key = String.format('%02d',new def[] { month })  
                    + '-' + 
                    String.format('%02d',new def[] { day });
          
          if (state.day_map.containsKey(key)) {
            state.day_map[key] += 1;
          } else {
            state.day_map[key] = 1;
          }
        ""","combine_script": "return state.day_map","reduce_script": "return states"
      }
    }
  }
}

屈服

{
  ...
  "aggregations":{
    "day_histogram":{
      "value":[
        {
          "09-26":2,"10-07":1
        }
      ]
    }
  }
}

---

编辑-实际上有一种更简单的方法：

GET regulations/_search
{
  "size": 0,"aggs": {
    "day_histogram": {
      "terms": {
        "script": {
          "source": "doc.created.value.monthOfYear + '-' + doc.created.value.dayOfMonth"
        },"size": 10
      }
    }
  }
}