Uninstall / remove Apache Solr 9.x completely

Problem:

Uninstall / remove Apache Solr 9.x completely

Solution:

service solr stop  && rm -rfv /var/solr && rm -v /etc/init.d/solr  && rm -rfv /opt/solr  && rm -rfv /opt/solr-9* && rm -rfv /etc/default/solr.in.sh

additionally (if needed): 

    sudo service solr stop 
    sudo userdel solr
    sudo groupdel solr
    sudo rm -r /opt/solr
    sudo rm -r /var/solr
    sudo rm /etc/init.d/solr
    systemctl daemon-reload
    sudo systemctl status solr