How perform has_child query for examples in ES 6.0

Question

Here is en examples about join type in elasticsearch. I have insert mapping, parents and children:

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

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

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

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

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

Now I am trying to search for parents by children:

GET /my_index/doc/_search
{
  "query": {
    "has_child": {
      "type": "my_join_field",
      "query": {
        "match" : {
          "text": "question"
        }
      },
      "ignore_unmapped": true
    }
  },
  "highlight" : {
    "fields" : {
      "content" : {}
    }
  }
}

And I got no results. :( >:(

First of all what type fields should be??? They are told that types are removed Second, I have to add ignore_unmapped (look here) and still no results

So how to find parent by has_child query for data in elasticsearch example?

Answer 1

Look at 11_parent_child.yml file. It contains indexing of parent, child and performs query for children. It is yaml but I think conversion to json is obvious.