The join datatype documentation says that relations should be specified in {"parent": "child"} manner. Am I understand correctly, that this means that it is not possible to add multiple relations for a single parent?
It is still possible to have multiple relations in a single parent. See https://www.elastic.co/guide/en/elasticsearch/reference/6.x/parent-join.html#_multiple_children_per_parent which explains that the value can be an array of children.
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