logstash-verify/pipe/base.yml

filter {
    if [type] == "syslog" {
        grok {
            match => { "message" => "%{SYSLOGTIMESTAMP:syslog_timestamp} %{SYSLOGHOST:syslog_hostname} %{DATA:syslog_program}(?:\[%{POSINT:syslog_pid}\])?: %{GREEDYDATA:syslog_message}" }
            remove_field => ["message"]
        }
        date {
            match => [ "syslog_timestamp", "MMM  d HH:mm:ss", "MMM dd HH:mm:ss" ]
            target => "@timestamp"
            remove_field => ["syslog_timestamp"]
        }
        mutate {
            remove_field => ["host"]
        }
    }
}