using sonarqube version 10
I was getting elastic search memory 95% used disk usage watermark
followed the instructions in docs of sonarsource and
stop the service and deleted es8 folder
and started the service.
the service was up, but when I hit the url it’s saying maintence or 502 or 504
Welcome 
means you need to increase your disk space first.
If any problems after that, we need to check the logs in $SONARQUBE_HOME/logs
Gilbert