I need to map Grandparent->parent->child but I don't know how to do that. I only know how to define a parent child relationship with "join datatype" but that's all.
Can you help me ?
you could try to have two different join fields (grandparent -> parent and parent -> child) in your mapping first and you also have to make sure that you index childs,parents and grandparent documents with the same routing value so they end up in the same shard.
Hope this helps.
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