Elastic Search problems with indexing documents with parents using bulk

gistfile1.txt

curl -XPOST localhost:9200/test -d '
{
    "mappings" : {
        "prediction" : {
            "_parent" : {
                "type" : "doc"
            }
        }
    }
}
'
curl -XPOST localhost:9200/_bulk -d '
        { "index" : { "_index" : "test", "_type": "doc", "_id" : "1" } }
        { "doc" : { "name" : "my_name" } }
'


curl -XPOST localhost:9200/_bulk -d '
        { "index" : { "_index" : "test", "_type": "prediction" }
        { "prediction" : { "_parent": "1", "val" : 0.2 } }
'