I have set JAVA_HOME to /usr. When i restart elasticsearch using systemctl i get following:

Job for elasticsearch.service failed because the control process exited with error code. See "systemctl status elasticsearch.service" and "journalctl -xe" for details.

If i set same value of JAVA_HOME in /etc/sysconfig/elasticsearch, it works.

Environment:

1. ES version 7.4.1
2. CentOS kernel 3.10.0-1062.1.2.el7.x86_64
3. Version : CentOS Linux release 7.7.1908 (Core)