This file is indexed.

/etc/kernel/postinst.d/x-grub-legacy-ec2 is in grub-legacy-ec2 1:1.

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

version="$1"
bootopt=""

# passing the kernel version is required
[ -z "${version}" ] && exit 0

# avoid running multiple times
if [ -n "$DEB_MAINT_PARAMS" ]; then
	eval set -- "$DEB_MAINT_PARAMS"
	if [ -z "$1" ] || [ "$1" != "configure" ]; then
		exit 0
	fi
fi

update=/usr/sbin/update-grub-legacy-ec2
[ ! -x "${update}" ] || exec "${update}"