This file is indexed.

/usr/share/initramfs-tools/hooks/rescuevol is in cloud-initramfs-rescuevol 0.25ubuntu1.

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

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

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

copy_exec /sbin/blkid /sbin

# vi: ts=4 noexpandtab