How Relations are created between vertex in graph

Elastic Stack Kibana
1

Hi Sir,
I can see the relation between the vertex in graph api but i cannot understand which vertex is parent and which vertex is child how to find that through graph api

2

There's no concept of parent and child in graph, they are simply linked vertices.

3

but graph will be related based on level hierarchy so how to know which vertex belong to which level

Lets say A is parent of B and C so

   A    -----level 0

B C ------level 1

How to find this in graph

What algorithm they use to create graph

4

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