The nis database file(passwd.adjunct) was modified after executing ypchsh command

Issue

After executing ypchsh command, the nis database file(/var/yp/etc/passwd.adjunct) was modified.

NIS Server:
# cat /var/yp/passwd.adjunct |grep user1
user1:$6$YKN1DF8j$CQuBPmHRzIG4LDY4nDy2GU7x1CbhxxsYq47O7WAnpDyjjPZMf0eS/SkxjhTXQxaB/NP4m4BalzG9T1ZVKFqYT/:17746:0:99999:7:::

NIS Client:
# ypchsh user1
Changing NIS account information for user1 on rhel6-ipa.nisdomain.local.
Please enter root password:

Changing login shell for user1 on rhel6-ipa.nisdomain.local.
To accept the default, simply press return. To use the
system's default shell, type the word "none".
Login shell [/bin/bash]: 

The login shell has been changed on rhel6-ipa.nisdomain.local.

NIS Server:
# cat /var/yp/passwd.adjunct |grep user1
user1:##user1:17751:0:99999:7:::