This file is indexed.

/usr/sbin/fence_ack_manual is in fence-agents 4.0.25-2ubuntu1.

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/bash
#
# Manual override after fencing has failed.
#

if [ "$1" = "-n" ]; then
	shift
fi

if [ -z "$1" ] || [ "${1:0:1}" = "-" ]; then
	echo "usage:"
        echo " 	$0 <nodename>"
        echo " 	$0 -n <nodename>"
	echo 
	echo "The -n flag exists to preserve compatibility with previous "
	echo "releases of $0, and is no longer required."
	exit 1
fi

declare answer

echo "About to override fencing for $1."
echo "Improper use of this command can cause severe file system damage."
echo
read -p "Continue [NO/absolutely]? " answer

if [ "$answer" != "absolutely" ]; then
	echo "Aborted."
	exit 1
fi

while ! [ -e /var/run/cluster/fenced_override ]; do
	sleep 1
done

echo $1>/var/run/cluster/fenced_override
echo Done