query based on a nested field

gistfile1.txt

POST http://localhost:9200/devices/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "nested": {
            "path": "contractAttributions",
            "query": {
              "bool": {
                "must": [
                  {
                    "match": {
                      "contractAttributions.contractNumber": "1111"
                    }
                  }
                ]
              }
            }
          }
        }
      ]
    }
  }
}