This file is indexed.

/usr/share/samba/setup/named.conf.update is in samba4 4.0.0~alpha18.dfsg1-4ubuntu2.

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

The actual contents of the file can be viewed below.

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/*
	this file will be automatically replaced with the correct
	'grant' rules by samba at runtime
*/