systemd tomcat.service exit code status=143

Anyone seen this issue below on Red Hat Enterprise Linux Server 7.2 ?

ExecStop=/opt/pacer/work/bin/shutdown.sh (code=exited, status=1/FAILURE)
(code=exited, status=143)

Tomcat.service starts fine, however, when i stop the service with "systemctl stop tomcat.service" I see the exit status code 143. I have added the StatusExitStatus=143 in /etc/systemd/system/tomcat.service and works fine but I think it's just a work around for now.