Hello everyone,
I'm looking for some wisdom of the elastic community 
Considering an app performing matching (like Tinder for instance). Would it be better to store the likes/dislikes of each user in a nested array or in a different document (using has_child for queries).
I'm aware that joins are expensive but in the case of the nested array, ES will reindex the all user everytime an user is liked/disliked.
Is it the typical case where joins should be used ?
Thanks for your help