This file is indexed.

/usr/share/initramfs-tools/hooks/btrfs is in btrfs-tools 0.19+20100601-3ubuntu3.

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

set -e

PREREQ=""

prereqs()
{
	echo "${PREREQ}"
}

case "${1}" in
	prereqs)
		prereqs
		exit 0
		;;
esac

. /usr/share/initramfs-tools/hook-functions

if [ -x /sbin/btrfsctl ]
then
	copy_exec /sbin/btrfsctl /sbin
fi