Java Upgrade doesn't stop elasticsearch. Why?

Elastic Stack Elasticsearch
1

I am using external JDK on Oracle Linux 7.9. Elasticsearch service is up and running when I upgrade the java. Also, there are no entries in log. I am not sure about this behavior.

Elasticsearch uses ES_JAVA_HOME=/usr/bin/java but it points to new directory after update ie. /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.342.b07-1.el7_9.x86_64/jre/bin/java and before it was /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.322.b06-1.el7_9.x86_64/jre/bin/java.

Can anyone explain? I expect elasticsearch to interrupt since after upgrade the older path doesn't exist.

ls -lrt /usr/bin/java
lrwxrwxrwx. 1 root root 22 Sep 12 05:43 /usr/bin/java -> /etc/alternatives/java

ls -lrt /etc/alternatives/java
lrwxrwxrwx. 1 root root 73 Sep 12 05:43 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.322.b06-1.el7_9.x86_64/jre/bin/java


# After upgrade
ls -lrt /etc/alternatives/java
lrwxrwxrwx. 1 root root 73 Sep 12 05:43 /etc/alternatives/java -> /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.342.b07-1.el7_9.x86_64/jre/bin/java
2

But it'll have the things it needs to run in memory (via the OS). You need to restart it if you want it to use the new one.

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