[Parent-child deletion] documentation says routing is required but without routing it works. [ES 6.5v]

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2

I got clear explanation through email.
So, in some cases I will success on it, in some cases not!
It means if doc is found without routing value it can be deleted, otherwise not.

Here is the experiment I got and id=3 or id=4 certainly CANNOT BE DELETED because of routing value.
Thanks for ES dev group!

Here is the Experiment

Define your index

PUT my_index
{
  "mappings": {
    "_doc": {
      "properties": {
        "my_join_field": { 
          "type": "join",
          "relations": {
            "question": "answer" 
          }
        }
      }
    }
  }
}

Index doc 1

PUT my_index/_doc/1?refresh
{
  "text": "This is a question",
  "my_join_field": "question" 
}

Index doc 2

PUT my_index/_doc/2?refresh
{
  "text": "This is another question",
  "my_join_field": "question"
}

Index doc 3 (answer to q1)

PUT my_index/_doc/3?routing=1&refresh
{
  "text": "This is an answer",
  "my_join_field": {
    "name": "answer", 
    "parent": "1" 
  }
}

Index doc 4 (answer to q2)

PUT my_index/_doc/4?routing=2&refresh
{
  "text": "This is another answer",
  "my_join_field": {
    "name": "answer",
    "parent": "2"
  }
}

Search for all parent child (returns total of 4 documents)

GET my_index/_search
{
  "query": {
    "match_all": {}
  },
  "sort": ["_id"]
}

GET _cat/indices/my_index?v
GET _cat/shards/my_index?v

Deleting documents 1 to 4, 3 or 4 doc deletion will fail

DELETE my_index/_doc/1
DELETE my_index/_doc/2
DELETE my_index/_doc/3
DELETE my_index/_doc/4

You should still see 1 or 2 orphan documents exist in the index

GET _cat/shards/my_index?v

To completely remove the documents - you'll need to provide the routing

DELETE my_index/_doc/3?routing=1
DELETE my_index/_doc/4?routing=2

Now it should be completely clear

GET _cat/shards/my_index?v

Confirm your search again

GET my_index/_search
{
  "query": {
    "match_all": {}
  },
  "sort": ["_id"]
}

Delete when done / convinced :wink: 

DELETE my_index
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