Output of nfs4_getfacl displays "uid" instead of username on the nfs-client

Issue

• On the NFS-server, getfacl command returns following output :

# getfacl /test4/
getfacl: Removing leading '/' from absolute path names
# file: test4/
# owner: root
# group: root
user::rwx
user:acluser:rw-       
group::r-x
mask::rwx
other::r-x

• While, nfs4_getfacl returns the following output on the NFS-client:

# nfs4_getfacl /client4/
A::OWNER@:rwaDxtTcCy
D::1000:x            
A::1000:rwaDtcy     
A::GROUP@:rxtcy
A::EVERYONE@:rxtcy

• nfs4_getfacl command displays UID instead of username.