This file is indexed.

/usr/share/initramfs-tools/hooks/multipath is in multipath-tools-boot 0.4.9-3ubuntu7.

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

PREREQS="udev"

prereqs() { echo "$PREREQS"; }

case $1 in
prereqs)
	prereqs
	exit 0
	;;
esac

if [ ! -x /sbin/multipath ]; then
	exit 0
fi

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

add_bindings()
{
  if [ -r /etc/multipath/bindings ]; then
      mkdir -p $DESTDIR/etc/multipath
      cp /etc/multipath/bindings $DESTDIR/etc/multipath
  fi
}

add_udev_rules()
{
  for rules in 95-multipath.rules; do
    if [ -e /lib/udev/rules.d/$rules ]; then
      cp -p /lib/udev/rules.d/$rules $DESTDIR/lib/udev/rules.d/
    fi
  done
}

copy_exec /sbin/multipath 		/sbin
mkdir -p $DESTDIR/lib/multipath/
for x in /lib/multipath/*; do
    copy_exec $x /lib/multipath/
done
add_udev_rules

[ -r /etc/multipath.conf ] && cp /etc/multipath.conf $DESTDIR/etc/
add_bindings

for x in dm-multipath dm-round-robin dm-emc; do
	manual_add_modules ${x}
done