Logstash come with command to control and use script file.We can't manage script file by configuration file yet. So start copy initfile to /etc/init.d
$cp init /etc/init.d/
rename to your program and change permission
$mv init logstash
change script to our program in line 13 to
cmd="/data/logstash-1.5.1/bin/logstash -f /data/logstash-1.5.1/conf/prepaid_forworder.conf &"
for more information go to original idea