弹性搜索 - 获取嵌套字段 [英] Elasticsearch - get nested fields

问题描述

  GET索引/ _search $ b $我想要只收集嵌套字段，但不能由于它不是叶子字段。 b {
size：10，
fields：[
nested_fields
] 
} 
  / pre> 
 
 
 错误：reason：field [nested_fields] not not a leaf field p> 
 
 
我尝试下面但不能匹配嵌套对象中的每个id和名称。
  GET索引/ _search 
 {
size：10，
fields：[
nested_fields.id，
nested_fields.name
] 
} 
  
结果：
 
 
 $ $ $ $ $ $ $ $ $ $ $ $ $ $ $$$$$$$ 25534，
63454
]，
events.name：[
R1413，
R1414，
 R1415，
R1416，
] 
} 
  

这是我的预期结果：

  fields：{
evets：{
id ：234234，
name：RP1524
}，
 .... so on 
} 
  / pre> 
 
解决方案
如果您没有某个特定查询应该与嵌套字段匹配，您可以这样做：
  GET / index / _search 
 {
size：10，
 _source：[nested_fields.id，nested_fields.name] 
} 
  
如果您还有一个嵌套的查询，并且您想返回匹配的嵌套文档，则可以这样执行（使用 inner_hits ）：
  {
查询：{
嵌套：{
path：nested_fields，
query：{match_all：{}}，
inner_hits：{} 
} 
} 
} 
  
 
I want to get only nested fields, but cannot since it's not leaf fields.
GET index/_search
{
    "size": 10,
    "fields": [
       "nested_fields"
    ]
}
ERROR : "reason": "field [nested_fields] isn't a leaf field"

I tried below but cannot match each id and name in nested object.
GET index/_search
    {
        "size": 10,
        "fields": [
           "nested_fields.id",
           "nested_fields.name"
        ]
    }
result : 
"fields": {
               "events.id": [
                  "13342",
                  "24232",
                  "25534",
                  "63454"
               ],
               "events.name": [
                  "R1413",
                  "R1414",
                  "R1415",
                  "R1416",
               ]
            }
Here is my expected result:
fields" : {
  "evets" : {
      "id" : "234234",
      "name" : "RP1524"
   },
    .... so on
}

解决方案
If you don't have a certain query that should match the nested fields somehow, you can do it like this:
GET /index/_search
{
  "size": 10,
  "_source": ["nested_fields.id", "nested_fields.name"]
}
If you also have a nested query and you want to return the nested docs that matched you can do it like this (with inner_hits):
{
  "query": {
    "nested": {
      "path": "nested_fields",
      "query": {"match_all": {}}, 
      "inner_hits": {}
    }
  }
}


                        
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