Raw Elasticsearch result:

    {
      "_shards": {
        "failed": 0,
        "successful": 5,
        "total": 5
      },
      "hits": {
        "hits": [
          {
            "_id": "...",
            "_index": "...",
            "_score": null,
            "_source": {
              "best_title": "...",
              "country_codes": {
                "f1": [
                  "AU",
                  "US"
                ]
              },
            },
            "_type": "cluster",
            "sort": [
              1422523651820
            ]
          },
    ...

Attempted query to match documents with `"US"` in the country codes:

    {
      "query": {
        "filtered": {
          "filter": {
            "and": [
              {
                "or": [
                  {
                    "term": {
                      "country_codes.f1": "US"
                    }
                  }
                ]
              }
            ]
          },
          "query": {
            "query_string": {
              "fields": [
                "best_title",
              ],
              "query": "*"
            }
          }
        }
      }
    }