gistfile1.txt

bin/logstash -e 'input {
    stdin {
    }
}

filter {
    ruby {
        code => "event['hello'] = 'world'"
    }
}

output {
    stdout { codec => rubydebug }
}'


Ruby exception occurred: undefined local variable or method `hello' for #<LogStash::Filters::Ruby:0x3ab3cd6e> {:level=>:error}