ElasticSearch：以groovy脚本访问文档嵌套值 [英] ElasticSearch: access document nested value in groovy script

问题描述

我有一个存储在ElasticSearch中的文档如下。
_source：

I have a document stored in ElasticSearch as below. _source:

 {
 "firstname": "John",
 "lastname": "Smith",
 "medals":[
           {
             "bucket": 100, 
             "count": 1
           },
           {
             "bucket": 150,
             "count": 2
           }
         ]
  }

我可以使用 doc.firstname 访问文档中的字符串类型值，用于脚本度量标准聚合 http://www.elasticsearch.org/guide/ en / elasticsearch / reference / current / search-aggregations-metrics-scripted-metric-aggregation.html 。

I can access the string type value inside a document using doc.firstname for scripted metric aggregation http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/search-aggregations-metrics-scripted-metric-aggregation.html.

但是我无法获取字段价值使用 doc.medals [0] .bucket。

But I am not able to get the field value using doc.medals[0].bucket.

你能帮我一下，让我知道访问嵌套字段中的值？

Can you please help me out and let me know how to access the values inside nested fields?

推荐答案

使用_source进行嵌套属性。
Doc保存加载到内存中的字段。嵌套文档可能无法加载，并且可以使用_source访问。

Use _source for nested properties. Doc holds fields that are loaded in memory. Nested documents may not be loaded and should be accessed with _source.

例如：

GET index/type
    {
     "aggs": {
      "NAME": {
      "scripted_metric": {
        "init_script": "_agg['collection']=[]",
        "map_script": "_agg['tr'].add(_source.propertry1.prop);",
        "combine_script": "return _agg",
        "reduce_script": "return _aggs"
      }
    }
  },
  "size": 0
}

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