Takes two or more arrays and returns an array containing the elements that appear in any input array.
https://docs.mongodb.com/manual/reference/operator/aggregation/setUnion/#mongodb-expression-exp.-setUnion
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Takes two or more arrays and returns an array containing the elements that appear in any input array.
https://docs.mongodb.com/manual/reference/operator/aggregation/setUnion/#mongodb-expression-exp.-setUnion