I was trying to use /dev/stdout as the beats output but failed to do so.
The config is like ...
### File as output file: # Enabling file output. enabled: true # Path to the directory where to save the generated files. The option is mandatory. path: "/dev" # Name of the generated files. The default is `topbeat` and it generates... filename: stdout
BTW, I just hope to use /dev/stdout for easier debugging of the beats output.