On the NFS client, execute the following command and in output check, if pnfs=not configured is present.
egrep "nfs(v)?4" /proc/self/mountstats
device NFS-Server-IP:/mnt/path-shared mounted on /mnt/point with fstype nfs4 statvers=1.2
nfsv4: bm0=0xfdfbbbff,bm1=0x40f9bui3e,bm2=0x906,acl=0x3,sessions,pnfs=not configured