[{"key":1},{"key":2}]

db.collection.aggregate([{"$match":{"author":{"$regex":"","$options":"i"},"genre":{"$in":["action","drama","sci - fi","romance","comedy"]}}},{"$sort":{"title":-1}},{"$facet":{"result":[{"$skip":0},{"$limit":5},{"$project":{"createdAt":0,"-createdAt":0,"-updatedAt":0,"-__v":0}}],"count":[{"$count":"count"}]}},{"$project":{"result":1,"count":{"$arrayElemAt":["$count",0]}}}])