Children are not mapping properly in elastic to parents - elasticsearch

Question

"chods": {
"mappings": {
"chod": {
"properties": {
"state": {
"type": "text"
}
}
},
"chods": {},
"variant": {
"_parent": {
"type": "chod"
},
"_routing": {
"required": true
},
"properties": {
"percentage": {
"type": "double"
}
}
}
}
},
When I execute:
PUT /chods/variant/565?parent=36442
{ // some data }
It returns:
{
"_index":"chods",
"_type":"variant",
"_id":"565",
"_version":6,
"result":"updated",
"_shards":{
"total":2,
"successful":1,
"failed":0
},
"created":false
}
But when I run this query:
GET /chods/variant/565?parent=36442
It returns variant with parent=36443
{
"_index": "chods",
"_type": "variant",
"_id": "565",
"_version": 7,
"_routing": "36443",
"_parent": "36443",
"found": true,
"_source": {
...
}
}
Why it returns with parent 36443 and not 36442?

Answer 1

When I tried to reproduce this with your steps, I got the expected result (version=36442). I noticed that after your PUT of the document with "_parent": "36442" the output is "_version":6. In your GET of the document, "_version": 7 is returned. Is it possible that you posted another version of the document?
I also noticed that GET /chods/variant/565?parent=36443 would not actually filter by the parent id - the query parameter is disregarded. If you actually want to filter by parent id, this is the query you're looking for:
GET /chods/_search
{
"query": {
"parent_id": {
"type": "variant",
"id": "36442"
}
}
}

Answer 2

As #fylie pointed out the main problem is that if you use same id of the document you will get your document overridden by last version - sort of
Lets say that we have index /tests and type "a" which is child of type "test" and we do following commands:
PUT /tests/a/50?parent=25
{
"item": "C"
}
PUT /tests/a/50?parent=26
{
"item": "D"
}
PUT /tests/a/50?parent=50
{
"item": "E",
"item2": "F",
}
What the result will be? Well it can result in creating 1 - 3 documents.
If it will route to the same shard, you will end up with one document, which will have 3 versions.
If it will route to 3 different shards, you will end up with 3 new documents.