[{"transactions":[{_id:1,created:"2022-12-21",firstname:"John",lastname:"Lenon"},{_id:2,created:"2022-12-31",firstname:"Jack",lastname:"Nicklson"},{_id:3,created:"2022-11-08",firstname:"Jenny",lastname:"Johnes"}]},{"key":2}]

db.collection.aggregate([{$match:{"transactions.created":"2022-12-21"}},{$addFields:{transactions:{"$filter":{"input":"$transactions","as":"t","cond":{$eq:["$$t.created","2022-12-21"]}}}}}])