Unable to search for parent and child documents using Elasticsearch

gistfile1.txt

I have a child document such as this:

{
  _index: prototype_2013.01.03
  _type: chow-clfg
  _id: PybhISPURJS5q5DbQMEnTA
  _score: 6.8785243
  _source: {
    chow-clfg: {
      @type: chow-clfg
      clfg: Cg5iU1BHZ88kAAAAYAE
      @timestamp: 2013-01-03T02:26:00.000Z
      count: 1
    }
  }
}

and I have parent documents such as this:

{
  _index: prototype_2013.01.03
  _type: chow-demo
  _id: _IZFN7tQSWiD9lwFrrKCTw
  _score: 10.197559
  _source: {
  timestamp: [03/Jan/2013:02:15:29 +0000]
  httpcode: [200]
  clfg: [Cg5iU1BHZ88kAAAAYAE]
  user_agent: ["Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/536.26.17 (KHTML, like Gecko) Version/6.0.2 Safari/536.26.17 -"]
  @timestamp: 2013-01-03T02:15:29.000Z
  @type: chow-demo
  }
}

However when I use the following curl command:

curl -XPOST "localhost:9200/prototype_2013.01.03/chow-demo/_search" -d 
'{
 "query": {
  "has_child": {
   "type": "chow-clfg",
   "query": {
    "term": {
      "clfg": "Cg5iU1BHZ88kAAAAYAE"
    }
   }
  }
 }
}'

I get absolutely no results.

My mappings are as follows for child documents:

          "chow-clfg" : {
            "dynamic" : "true",
            "_source" : {
              "enabled" : true
            },
            "_ttl" : {
              "enabled" : true,
              "default" : "30m"
            },
            "properties" : {
              "@timestamp" : {
                "format" : "dateOptionalTime",
                "type" : "date"
              },
              "clfg" : {
                "analyzer" : "keyword",
                "type" : "string"
              },
              "count" : {
                "type" : "long"
              },
              "@type" : {
                "analyzer" : "keyword",
                "type" : "string"
              }
            },
            "_parent" : {
              "type" : "chow-demo"
            }

While parent documents are as follows:

          "chow-demo" : {
            "properties" : {
              "@fields" : {
                "dynamic" : "true",
                "properties" : {
                  "clfg" : {
                    "analyzer" : "keyword",
                    "type" : "string"
                  },
                  "httpcode" : {
                    "type" : "long"
                  },
                  "timestamp" : {
                    "type" : "string"
                  },
                  "user_agent" : {
                    "analyzer" : "keyword",
                    "type" : "string"
                  },
                }
              },
              "@timestamp" : {
                "format" : "dateOptionalTime",
                "type" : "date"
              },
              "@type" : {
                "analyzer" : "keyword",
                "type" : "string"
              }
            }
          }

I am not sure why there should be no results at this point.