Parent-Child Relationship while upgrading ES 2.4 to 7.6

I am upgrading ES 2.4 to 7.6.

Previously I had two different types in ES 2.4, say A and B. 'A' was parent and 'B' was child.
Now, what would be the best way maintain this relationship in ES 7.6?

Possibilities I came to figure out:

  1. Use Join?
  2. Use parent/child inside a document(since 7.6 is type-less)?
  3. Or are there any other new techniques?

Open to any comment or suggestion. An elaborated answer would be appreciated.
Thanks in advance

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