{
  "test_nested": {
    "mappings": {
      "my_type": {
        "properties": {
          "group": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "user": {
            "type": "nested",
            "properties": {
              "name": {
                "type": "text",
                "fields": {
                  "keyword": {
                    "type": "keyword",
                    "ignore_above": 256
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

{
  "took": 2,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 4,
    "max_score": 1,
    "hits": [
      {
        "_index": "test_nested",
        "_type": "my_type",
        "_id": "AWG5iVBz4bQsVnslc9gL",
        "_score": 1,
        "_source": {
          "group": "fans",
          "user": [
            {
              "name": "Linux"
            },
            {
              "name": "Android (operating system)"
            },
            {
              "name": "Widows 10"
            }
          ]
        }
      },
      {
        "_index": "test_nested",
        "_type": "my_type",
        "_id": "AWG5ieKW4bQsVnslc9gM",
        "_score": 1,
        "_source": {
          "group": "fans",
          "user": [
            {
              "name": "Bitcoin"
            },
            {
              "name": "PHP"
            },
            {
              "name": "Microsoft Windows"
            }
          ]
        }
      },
      {
        "_index": "test_nested",
        "_type": "my_type",
        "_id": "AWG5irrV4bQsVnslc9gN",
        "_score": 1,
        "_source": {
          "group": "fans",
          "user": [
            {
              "name": "Windows XP"
            }
          ]
        }
      },
      {
        "_index": "test_nested",
        "_type": "my_type",
        "_id": "1",
        "_score": 1,
        "_source": {
          "group": "fans",
          "user": [
            {
              "name": "iOS"
            },
            {
              "name": "Android (operating system)"
            },
            {
              "name": "Widows 10"
            },
            {
              "name": "Widows XP"
            }
          ]
        }
      }
    ]
  }
}