[{"created_at":ISODate("2022-10-13T09:32:45.000Z"),"source":{"created_at":ISODate("2021-10-13T08:54:06.000Z"),"some_id":NumberInt(234),"another_id":NumberInt(11)},"first_name":"Test","last_name":"Test","date_of_birth":"1970-01-01","status":"active","numbers":[{"created_at":ISODate("2022-11-13T09:32:45.000Z"),"number":"40000005"}]},{"created_at":ISODate("2022-10-13T09:32:45.000Z"),"source":{"created_at":ISODate("2021-10-13T08:54:06.000Z"),"some_id":NumberInt(234),"another_id":NumberInt(11)},"first_name":"Test","last_name":"Test","date_of_birth":"1970-01-01","status":"active","numbers":[{"created_at":ISODate("2022-11-13T09:32:45.000Z"),"number":"50000005"}]}]

db.collection.aggregate([{$match:{numbers:{$elemMatch:{number:{$regex:"^4"}}}}}])