Android - Class java.util.Map has generic type parameters, please use GenericTypeIndicator instead

I know there's a lot of similar questions like mine, but I've read and tried everything but still unable to solve this issue. What I am trying to achieve is to populate my listview with the data from the firebase. Im following a tutorial on youtube but Ive added some stuff, timestamp in particular. The error is in my for loop and says :

Class java.util.Map has generic type parameters, please use GenericTypeIndicator instead

This is my database looks like :

My Notes.java

    public class Notes {
String noteId;
String noteCategory;
String note;
String rating;
public Map timeStamp;

public Notes(){

}

public Notes(String noteId, String noteCategory, String note, String rating, Map timeStamp) {
    this.noteId = noteId;
    this.noteCategory = noteCategory;
    this.note = note;
    this.rating = rating;
    this.timeStamp = timeStamp;
}


public String getNoteId() {
    return noteId;
}

public String getNoteCategory() {
    return noteCategory;
}

public String getNote() {
    return note;
}

public String getRating() {
    return rating;
}

public Map<String,String> getTimeStamp() { return timeStamp;}
}

And below is my NoteList.java

@Override
protected void onStart() {
    super.onStart();
    databaseNotes.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            notesList.clear();
            for(DataSnapshot noteSnapshot : dataSnapshot.getChildren()){
                Notes notes = noteSnapshot.getValue(Notes.class);
                notesList.add(notes);

            }

            NoteList adapter = new NoteList(MyNotes.this, notesList);
            listViewNotes.setAdapter(adapter);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

Any advice would be greatly appreciated! Thank you in advance.

EDIT : Okay, Ive tried the suggested answer, and after I logged the map it shows my data on the console. However, how do I iterate my map into the listview ?

Map<String, Object> map = (Map<String, Object>) dataSnapshot.getValue();