How to print events and fields in Logstash using Ruby code?

[EZprogramming (Kourosh)]

Yes, that worked, except fieldname needs to be in strings " ", and not ' '. Thanks for your help @shin-higuchi!

Solution:

filter {
    ruby {
        code => 'puts event.get("message")'
    }
}

or

filter {
    ruby {
        code => 'puts event.get("[message]")'
    }
}