Get list of nfs datastores

esxcli storage nfs list

or

esxcli storage nfs41 list

Volume Name       Host(s)      Share       Accessible  Mounted  Read-Only  Security   isPE  Hardware Acceleration
----------------  -----------  ----------  ----------  -------  ---------  --------  -----  ---------------------
nfs_lq2_vmbak     172.16.0.25  /VMbak            true     true      false  AUTH_SYS  false  Not Supported
nfs_lq1_vmlab4    172.16.0.5   /vm_lab4          true     true      false  AUTH_SYS  false  Not Supported
nfs_lq1_vmlab3    172.16.0.5   /vm_lab3          true     true      false  AUTH_SYS  false  Not Supported
nfs_lq1_vmlab2    172.16.0.5   /vm_lab2          true     true      false  AUTH_SYS  false  Not Supported
nfs_lq1_vmlab5    172.16.0.5   vm_lab5           true     true      false  AUTH_SYS  false  Not Supported
nfs_lq1_vmlab0    172.16.0.5   /vm_lab0          true     true      false  AUTH_SYS  false  Not Supported
nfs_lq1_repos     172.16.0.5   /repos            true     true      false  AUTH_SYS  false  Not Supported
nfs_lq1_esxilab0  172.16.0.5   /esxi_lab0        true     true      false  AUTH_SYS  false  Not Supported
nfs_lq1_vmlab1    172.16.0.5   /vm_lab1          true     true      false  AUTH_SYS  false  Not Supported

Now remove the datastore:

esxcli storage nfs remove -v NFS_Datastore_Name

After that you can add the storage again:

esxcli storage nfs add -H NFS_IP|NFS_HOSTNAME -s Share_mount_point_on_the_NFS -v DatastoreName