select matching objects from array in elasticsearch

Question

{
    class: 1,
    users: [{
        name: 'abc',
        surname: 'def'
    }, {
        name: 'xyz',
        surname: 'wef'
    }, {
        name: 'abc',
        surname: 'pqr'
    }]
}

I have a document structure like above object and I want to return only users who have name 'abc' but problem is it matches name 'abc' but returns all array. I want only matched users .

Mapping -

{
        "class":"string",
        "users" : {
            "type" : "nested",
            "properties": {
                "name" : {"type": "string" },
                "surname"  : {"type": "string" }
            }
        }
    }

Answer 1

Then if you have your users field mapped as nested type, it's a good start!

Using nested inner_hits, you can retrieve only the matching user names with a query like this one:

{
  "_source": false,
  "query": {
    "nested": {
      "path": "users",
      "inner_hits": {        <---- this is where the magic happens
        "_source": [
          "name"
        ]
      },
      "query": {
        "bool": {
          "must": [
            {
              "term": {
                "users.name": "abc"
              }
            }
          ]
        }
      }
    }
  }
}