This file is indexed.

/etc/netgroup is in nis 3.17-32ubuntu6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#
# netgroup	The netgroup file. Entries look like this:
#
#		   netgroup  (host,user,domain)  (host,user,domain) ..
#
#		So for example a netgroup for powerusers could be:
#
#		   powerusers  (,miquels,) (,torvalds,) (,fubar,)
#
#		And an entry in the password file like
#
#		   +@powerusers:::::: 
#		   +:*:::::/etc/NoShell
#
# 		would give access only to the users in "powerusers", while the
# 		other users would be known to the system but have an invalid
#		shell AND an invalid password (with Linux, you can also
#		override the password field).
#

# powerusers (,miquels,) (,torvalds,) (,fubar,)
# ourhosts   (picard,,) (enterprise,,) (laforge,,) (Q,,)