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db.collection.aggregate([{"$addFields":{"refunds":{"$concatArrays":["$refunds",[{"amount":"$amount","createDate":"$createDate"}]]}}},{"$unwind":{"path":"$refunds"}},{"$replaceRoot":{"newRoot":{"$mergeObjects":["$$ROOT","$refunds"]}}},{"$unset":["refunds"]},{"$sort":{"createDate":-1}},{"$limit":10}])