[{"_id":1,"name":"businessName1","reviews":[{"_id":"1","comment":"comment1",},{"_id":"2","comment":"comment2",},{"_id":"3","comment":"comment3",},{"_id":"4","comment":"comment4",},{"_id":"5","comment":"comment5",}]}]

db.collection.aggregate([{$project:{_id:0,reviews:{$slice:["$reviews",3,5]},total:{$size:"$reviews"}}}])