MongoDB Simple CRUD Operations using Spring MongoRepository

I want simple CRUD Operations using MongoRepository in Spring Boot Service. Say service name : CRUDService. The operations should happen as follows. 1)There can be 3 types of incoming messages for the CRUDService. a) CONNECT b) MESSAGE c) DISCONNECT 2)There are outgoing message. Any incoming message of type "MESSAGE" should be saved in DB. The other 2 don't need to be saved. All outgoing message should be saved. Let's say there are 10 applications/users talking to the service. I should be able to get all the incoming and outgoing messages in order of the timestamp for any user at any point of time(sorted according to the timestamp) These are the read and write operations. The user should also be able to replace last message sent out by the CRUDService with another message of his own in the DB. (Update)