有没有办法用嵌套的 json 在 elasticsearch 中搜索？

Question

In elastic search data has been saved in below format:

{
'name': 'somename',
'data': '{"age": 25}'
}

How to search like

{"match": {"data.age": 25}}

Answer 1

You need to use the nested data type for your data field and then you can use the example given in the same doc to query the nested fields.

In short, you need to include the nested path in your query if its indexed properly.

"nested": {
      "path": "data",

Adding end to end working example, according to your sample

Index mapping

{
    "mappings": {
        "properties": {
            "name" : {
                "type" : "text"
            },
            "data": {
                "type": "nested"
            }
        }
    }
}

Index request

{
    "name": "somename",
    "data": {
        "age": 25
    }
}

search request

{
    "query": {
        "nested": {
            "path": "data",
            "query": {
                "match": {
                    "data.age": 25
                }
            }
        }
    }
}

And search result

"hits": [
            {
                "_index": "nested",
                "_type": "_doc",
                "_id": "1",
                "_score": 1.0,
                "_source": {
                    "name": "somename",
                    "data": {
                        "age": 25
                    }
                }
            }
        ]

Answer 2

GET /myIndex/_search

{
  "query": {
    "nested": {
      "path": "data",
      "query": {
          {"match": {"data.age": 25}}
      }
    }
  }
}

See https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-nested-query.html for more info.