Parent-child-grandchild relationship in Elasticsearch6

Elastic Stack Elasticsearch
1

Is there any way that we can implement the below mappings/scenario in elasticsearch 6?
A {id}
B (Child of A){id, parentid}
C (Child of B){id, parentid}
D(Child of A){id, parentid}

Since types are deprecated from version 6. Do we need to create all the above four as indices?
How can we query A to get all documents (including its children & grandchildren) with id=xxx

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