"chods": {
  "mappings": {
     "chod": {
        "properties": {
           "state": {
              "type": "text"
           }
        }
     },
     "chods": {},
     "variant": {
        "_parent": {
           "type": "chod"
        },
        "_routing": {
           "required": true
        },
        "properties": {
           "percentage": {
              "type": "double"
           }
        }
     }
  }
},

PUT /chods/variant/565?parent=36442
{ // some data }

{
  "_index":"chods",
  "_type":"variant",
  "_id":"565",
  "_version":6,
  "result":"updated",
  "_shards":{
     "total":2,
     "successful":1,
     "failed":0
  },
  "created":false
}

GET /chods/variant/565?parent=36442

{
   "_index": "chods",
   "_type": "variant",
   "_id": "565",
   "_version": 7,
   "_routing": "36443",
   "_parent": "36443",
   "found": true,
   "_source": {
      ...
   }
}

GET /chods/_search
{
  "query": {
    "parent_id": {
      "type": "variant",
      "id": "36442"
    }
  }
}