Elasticsearch Parent-Child-Grandchild problem

gistfile1.js

curl -XPOST 'http://localhost:9200/index1' -d '{
    "settings" : {
        "number_of_shards" : 5,
        "number_of_replicas" : 1
    },


    "mappings" : {
	"type1" : {	      
	      "properties" : {
		"field1" : {
		  "type" : "string"
		}
	      }
	    },
	"type2" : {	      
	      "_parent" : {
		"type" : "type1"
	      },
	      "properties" : {
		"field2" : {
		  "type" : "string"
		}
	      }
	    },

	"type3" : {	      
	      "_parent" : {
		"type" : "type2"
	      },
	      "properties" : {
		"field3" : {
		  "type" : "string"
		}
	      }
	    }
    }
}'

#####
# index 3 level 1 docs.
curl -XPOST 'http://localhost:9200/index1/type1/' -d '{"field1":"one"}'
{"ok":true,"_index":"index1","_type":"type1","_id":"P6pC-Vp_S6GlzzYHdugeHw","_version":1}

curl -XPOST 'http://localhost:9200/index1/type1/' -d '{"field1":"two"}'
{"ok":true,"_index":"index1","_type":"type1","_id":"Fj9E3BSBT-yr8ELDwntMlw","_version":1}

curl -XPOST 'http://localhost:9200/index1/type1/' -d '{"field1":"three"}'
{"ok":true,"_index":"index1","_type":"type1","_id":"RfFUdumPT1mrlYcsm01viQ","_version":1}

#####
# sub index two level 2 docs for each level 1 doc
curl -XPOST 'http://localhost:9200/index1/type2/?parent=P6pC-Vp_S6GlzzYHdugeHw' -d '{"field2":"a"}'
{"ok":true,"_index":"index1","_type":"type2","_id":"6K2VV9vaRYqy0jYj7_fUhg","_version":1}

curl -XPOST 'http://localhost:9200/index1/type2/?parent=P6pC-Vp_S6GlzzYHdugeHw' -d '{"field2":"b"}'
{"ok":true,"_index":"index1","_type":"type2","_id":"Jx-kK-o6QweEZHo5j4rnyQ","_version":1}

curl -XPOST 'http://localhost:9200/index1/type2/?parent=P6pC-Vp_S6GlzzYHdugeHw' -d '{"field2":"c"}'
{"ok":true,"_index":"index1","_type":"type2","_id":"-7FCJKpnRqqRnilmq4nSUQ","_version":1}


curl -XPOST 'http://localhost:9200/index1/type2/?parent=Fj9E3BSBT-yr8ELDwntMlw' -d '{"field2":"aa"}'
{"ok":true,"_index":"index1","_type":"type2","_id":"Y3-swLFCQge2ZTY7s3dIxQ","_version":1}

curl -XPOST 'http://localhost:9200/index1/type2/?parent=Fj9E3BSBT-yr8ELDwntMlw' -d '{"field2":"bb"}'
{"ok":true,"_index":"index1","_type":"type2","_id":"D1SkieKlRqS8ArRk7i55jw","_version":1}

curl -XPOST 'http://localhost:9200/index1/type2/?parent=Fj9E3BSBT-yr8ELDwntMlw' -d '{"field2":"cc"}'
{"ok":true,"_index":"index1","_type":"type2","_id":"cgke5Sk-RE-RK9KAE6sbEw","_version":1}



#####
# sub index a level 3 docs for each level 2 doc
curl -XPOST 'http://localhost:9200/index1/type3/?parent=6K2VV9vaRYqy0jYj7_fUhg' -d '{"field3":"1"}'
{"ok":true,"_index":"index1","_type":"type3","_id":"Xvc-EtbaT-iBrvPPilyfkw","_version":1} 
curl -XPOST 'http://localhost:9200/index1/type3/?parent=Jx-kK-o6QweEZHo5j4rnyQ' -d '{"field3":"2"}'
{"ok":true,"_index":"index1","_type":"type3","_id":"NN9u94NqQ0ahGfQxum4EMw","_version":1} 
curl -XPOST 'http://localhost:9200/index1/type3/?parent=-7FCJKpnRqqRnilmq4nSUQ' -d '{"field3":"3"}'
{"ok":true,"_index":"index1","_type":"type3","_id":"f4J9LgpRSO--WwSNc5CwfA","_version":1} 
curl -XPOST 'http://localhost:9200/index1/type3/?parent=Y3-swLFCQge2ZTY7s3dIxQ' -d '{"field3":"11"}'
{"ok":true,"_index":"index1","_type":"type3","_id":"EOPzM5MbQ62kiH4iuXU-tA","_version":1} 
curl -XPOST 'http://localhost:9200/index1/type3/?parent=D1SkieKlRqS8ArRk7i55jw' -d '{"field3":"22"}'
{"ok":true,"_index":"index1","_type":"type3","_id":"rROD8R75QiO2ycyUSpN-Ag","_version":1}
curl -XPOST 'http://localhost:9200/index1/type3/?parent=cgke5Sk-RE-RK9KAE6sbEw' -d '{"field3":"33"}'
{"ok":true,"_index":"index1","_type":"type3","_id":"RQYkVWgzTRuwxEzMFoO-SA","_version":1}

# Now let's see how many level 3 documents we have (we are expecting 6):
curl -XPOST 'http://localhost:9200/index1/type3/_search?pretty=true' -d '{
  "query": {
              "match_all": {}
            }
          }'
ANSWER:
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 6,
    "max_score" : 1.0,
    "hits" : [ {
... ETC


##########
# when using "has child" query, we only get two

curl -XPOST 'http://localhost:9200/index1/type3/_search?pretty=true' -d '{
  "query": {
    "bool": {
      "must": [
        {
          "has_parent": {
            "parent_type": "type2",
            "query": {
              "match_all": {}
            }
          }
        }
      ]
    }
  }
}'


{
  "took" : 3,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 2,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "index1",
      "_type" : "type3",
      "_id" : "EOPzM5MbQ62kiH4iuXU-tA",
      "_score" : 1.0, "_source" : {"field3":"11"}
    }, {
      "_index" : "index1",
      "_type" : "type3",
      "_id" : "Xvc-EtbaT-iBrvPPilyfkw",
      "_score" : 1.0, "_source" : {"field3":"1"}
    } ]
  }
}