This file is indexed.

/usr/share/initramfs-tools/scripts/local-premount/btrfs is in btrfs-progs 4.15.1-1build1.

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

if [ -x /bin/btrfs ]
then
	modprobe btrfs
	# If asked to be quiet, show only errors
	[ "${quiet}" = "y" ] && exec >/dev/null
	/bin/btrfs device scan
fi