When I connect me with a user who has the role kibana_user_dashbord_only, I see nothing. It's like I have nothing in my cluster.
With kibana_user_dashbord_only:
Here my user with his role:
My dashbord with superuser:

I use the version 6.2.2.
Does someone have an idea of problem ?
Have you created a role that gives access to the indices that hold data? Have you assigned this to the user with the kibana_user_dashbord_only role?
No I just use this role as is.
You mean it's necessary to create something like this ->
Create a role that has read access to just the indices that hold your data. Do not include .kibana here. Then add this new role as well as the kibana_user_dashbord_only role to a user.
It was simply in fact, I didn't think at this solution.
Thank you.