This file is indexed.

/sbin/coldreboot is in kexec-tools 1:2.0.2-3ubuntu4.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
NOKEXECFILE=/tmp/no-kexec-reboot

/bin/rm -f $NOKEXECFILE
touch $NOKEXECFILE
/sbin/reboot $*