Upgrade fleet server

Hello
As I have seen a new version available I decided to upgrade

Elasticsearch server OK :white_check_mark:
Logstas server OK :white_check_mark:
Elasticsearch server OK :white_check_mark:
kibana server OK :white_check_mark:
Fleet server [don't know] :face_with_diagonal_mouth:

I understand that the fleet server is an agent that takes the role of coordinator or administrator of the other agents.

Should I just stop the service with a systemctl stop elastic-agent and then do an apt-get update && apt-get install elastic-agent ?

As the agent that is in the fleet server acts as the administrator or coordinator of the other agents, it must be updated in a different way. I did it with the
command

sudo elastic-agent upgrade 8.15.3