cannot kill OLS process

#1
My OLS returns 500 error. So I tried to restart with "systemctl restart openlitespeed". No message returns, but still 500 error from the domain log.
Then I tried to kill process ID

Code:
[root@main httpd]# ps aux |grep openlitespeed
root      42160  0.0  0.0 112812   976 pts/0    S+   17:12   0:00 grep --color=auto openlitespeed
root     116734  0.0  0.0  39880  2476 ?        S    00:11   0:11 openlitespeed (lshttpd - main)
apache   116736  2.0  0.7 167956 120036 ?       SN   00:11  20:51 openlitespeed (lshttpd - #01)
apache   116737  2.0  0.7 165260 119232 ?       SN   00:11  20:50 openlitespeed (lshttpd - #02)
[root@main httpd]# kill 116734
[root@main httpd]# kill 116734
[root@main httpd]# ps aux |grep openlitespeed
root      42166  0.0  0.0 112812   976 pts/0    S+   17:12   0:00 grep --color=auto openlitespeed
root     116734  0.0  0.0  39880  2476 ?        S    00:11   0:11 openlitespeed (lshttpd - main)
apache   116736  2.0  0.7 167956 120036 ?       SN   00:11  20:51 openlitespeed (lshttpd - #01)
apache   116737  2.0  0.7 165260 119232 ?       SN   00:11  20:50 openlitespeed (lshttpd - #02)
But as you see, the process 116734 is still there. At the end, I needed to restart the server.

How can I kill OLS's processes and restart the service without restart the whole server?
Thank you.
 
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