Sonarqube fails to start after reboot

Question

I don't get much information from systemctl status:

sonar.local.lab sonar.sh[4471]: Gracefully stopping SonarQube...
sonar.local.lab sonar.sh[4471]: Removed stale pid file: ./SonarQube.pid
sonar.local.lab sonar.sh[4471]: SonarQube was not running.

From /var/log/sonarqube/es.log

java.lang.RuntimeException: can not run elasticsearch as root
        at org.elasticsearch.bootstrap.Bootstrap.initializeNatives(Bootstrap.java:107) ~[elasticsearch-7.17.4.jar:7.17.4]
        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:183) ~[elasticsearch-7.17.4.jar:7.17.4]
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:434) [elasticsearch-7.17.4.jar:7.17.4]
        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:166) [elasticsearch-7.17.4.jar:7.17.4]
        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:157) [elasticsearch-7.17.4.jar:7.17.4]
        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:77) [elasticsearch-7.17.4.jar:7.17.4]
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:112) [elasticsearch-cli-7.17.4.jar:7.17.4]
        at org.elasticsearch.cli.Command.main(Command.java:77) [elasticsearch-cli-7.17.4.jar:7.17.4]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:122) [elasticsearch-7.17.4.jar:7.17.4]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:80) [elasticsearch-7.17.4.jar:7.17.4]
2023.11.01 16:26:49 ERROR es[][o.e.b.ElasticsearchUncaughtExceptionHandler] uncaught exception in thread [main]

/etc/systemd/system/sonar.service

[Unit]
Description=SonarQube 9.6.1.59531 service
Requires=network.target
After=network.target network-online.target
Wants=network-online.target

[Service]
Type=forking
User=sonar
Group=sonar
ExecStart=/my/custom/path/sonarqube-9.6.1.59531/bin/linux-x86-64/sonar.sh start
ExecStop=/my/custom/path/sonarqube-9.6.1.59531/bin/linux-x86-64/sonar.sh stop
ExecReload=/my/custom/path/sonarqube-9.6.1.59531/bin/linux-x86-64/sonar.sh restart
Restart=on-failure
RestartSec=10
PIDFile=/my/custom/path/sonarqube-9.6.1.59531/bin/linux-x86-64/SonarQube.pid
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

I have verified the user and group sonar is owner of owner of every file under /my/custom/path/...

I don't know why elasticsearch complains about running as root. Yes, I try to restart the service running: systemctl restart sonar, however, from the sonar.service file, woulnd't this be run a the sonar user and group?