I can't really help with the NFS storage provisioner and it would probably be good to engage with NFS provisioner project. I noticed however that the nfs-client-provisioner project is deprecated.
There is another more fundamental issue here and that is that it is not recommended to use NFS volumes for the Elasticsearch data volume to begin with. This discussion thread offers a bit more context as to why that is the case and it is also mentioned in the Elasticsearch documentation,