Ubuntu 14.04 logstash 2.3.2-1 service logstash restart failed

after run
apt-get install logstash
and set /etc/default/logstash
KILL_ON_STOP_TIMEOUT=1

service logstash stop 
failed with following error

/etc/init.d/logstash: 100: [: 1: unexpected operator

on /etc/init.d/logstash in first line i see 
# !/bin/sh

but in line 100 i see 
if [ "$KILL_ON_STOP_TIMEOUT" == 1 ] ; then

this not work in sh, only for bash
