I've followed the code path of the to_syslog option and this feature should only work under unix system, if you use that under windows you should see the following error in your log.
syslog is not supported on this OS
I will create an issue to remove that documentation in windows.
@Nickname_Yu The option you were referring was to send Winlogbeat own logs to Syslog. It that the goal you were trying to achieve OR you want to send all the events read from Winlogbeat to a Syslog server?
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