Why do I get "unbound immediate PersistentVolumeClaims" on Minikube?

In order to make a volume accessed my many pods, the accessModes need to be "ReadWriteMany" . Also if each pod wants to have its own directory then subPath need to be used.

As the issue was resolved in comment section @Michael Böckling . Here is further information using-subpath

volumeMounts: 
- name: data 
mountPath: /usr/share/elasticsearch/data 
subPath: $(POD_NAME)