So I have to set the ES_JAVA_HOME regardless? I thought if I use the bundled OpenJDK in Ubuntu 18.04 I wouldn't have to set the ES_HAVA_HOME variable. But in the VM I setup, I dont see a bundled Java version install, so its asking me to install the OpenJDK 11. I dont mind installing it but once I install it, then I will have to set the ES_JAVA_HOME value for each node? and is there by a default value i should set it to for OpenJDK 11? (It will be a clean server when i install it and will be the only version of java on it)