[{operatorName:"bob",users:[{email:"123@123.com",payment:125,paymentsData:"5/7/14",product:"someProduct",},{email:"demouser@mail.com",payment:33,paymentsData:"5/9/18",product:"someProduct",}],},{operatorName:"josh",users:[{email:"456@123.com",payment:55,paymentsData:"9/9/19",product:"someProduct",},{email:"another@mail.com",payment:388,paymentsData:"12/1/22",product:"someProduct",}],}]

db.collection.aggregate([{$match:{operatorName:"bob","users.email":"demouser@mail.com"}},{$project:{operatorName:"$operatorName",users:{$filter:{input:"$users",as:"user",cond:{$eq:["$$user.email","demouser@mail.com"]}}}}}])