How to filter syslog messages sent to a Syslog server

Hello.

We have a Fortigate where we have configured exporting syslog messages to an external syslog server, the problem we have is that we are getting alot of syslog messages most of them informational and Notification severity. Is there a way we can filter what messages to send to the syslog server? for example,  only to get messages of  Warning severity or above.