netstat -tulpn | grep 8983 what is blocking that port (jetty8) and do a
systemctl stop jetty8.service
Edit to elaborate a little more:
netstat shows you the PID of the process:
tcp6 0 0 127.0.0.1:8983 :::* LISTEN PID/java
systemctl status | grep -B 1 "PID" you will find the service that is controlling it.