Date filter (numeric_range) on nested item

gistfile1.txt

curl -XPUT http://localhost:9200/myindex

curl -XPUT http://localhost:9200/myindex/clinic/_mapping -d '{
    "clinic": {
        "properties": {
            "hours": {
                "type": "nested",
                "properties": {
                    "close": {
                        "type": "date",
                        "format": "HH:mm"
                    },
                    "day": {
                        "type": "long"
                    },
                    "open": {
                        "type": "date",
                        "format": "HH:mm"
                    }
                }
            },
            "name": {
                "type": "string"
            }
        }
    }
}
'

curl -XPUT http://localhost:9200/myindex/clinic/1 -d '
{ "name": "Clinic 1",
  "hours": [  {"day": 0, "open": "09:00", "close": "18:00"},
              {"day": 1, "open": "09:00", "close": "18:00"}  ]
}
'

curl -XPUT http://localhost:9200/myindex/clinic/2 -d '
{ "name": "Clinic 2",
  "hours": [  {"day": 0, "open": "07:00", "close": "16:00"},
              {"day": 1, "open": "08:00", "close": "17:00"}  ]
}
'


curl -XGET http://localhost:9200/myindex/clinic/_search?pretty=true-d '
{
  "query": {
   "nested" : {
        "path" : "hours",
        "score_mode" : "avg",
        "filter" : {
            "bool" : {
                "must" : [
                    {
                        "numeric_range" : {"hours.open" : {
                          "lte": "08:00"}
                        }
                    }
                ]
            }
        }
    }

  }
}
'


{
  "took" : 4,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 2,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "myindex",
      "_type" : "clinic",
      "_id" : "1",
      "_score" : 1.0, "_source" :
		{ "name": "Clinic 1",
		  "hours": [  {"day": 0, "open": "09:00", "close": "18:00"},
		              {"day": 1, "open": "09:00", "close": "18:00"}  ]
		}
    }, {
      "_index" : "myindex",
      "_type" : "clinic",
      "_id" : "2",
      "_score" : 1.0, "_source" :
		{ "name": "Clinic 2",
		  "hours": [  {"day": 0, "open": "07:00", "close": "16:00"},
		              {"day": 1, "open": "08:00", "close": "17:00"}  ]
		}
    } ]
  }
}