This file is indexed.

/usr/share/initramfs-tools/hooks/btrfs is in btrfs-tools 4.4-1.

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 /bin/btrfs ]
then
	copy_exec /bin/btrfs /bin
	copy_exec /bin/btrfs-zero-log
	if [ ! -x /usr/share/initramfs-tools/hooks/fsck ] && [ ! -x /etc/initramfs-tools/hooks/fsck ]
	then
	    copy_exec /bin/fsck.btrfs /bin
	fi
fi