This file is indexed.

/usr/lib/tasksel/tests/debconf is in tasksel 3.39.

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
#
# Allows a task to be enabled or disabled if tasksel is running inside a
# debconf instance, as in the first stage Debian install.
#
# To enable this test insert your tasks stanza a keyword like:
#
# Test-debconf: false
#
# This will cause the task to be available only if tasksel is not running
# in debconf.

if [ "$DEBIAN_HAS_FRONTEND" ] || [ "$DEBCONF_READFD" ]; then
	if [ "$2" = true ]; then
		exit 3 # display task, not marked for installation
	fi
else
	if [ "$2" = false ]; then
		exit 3 # display task, not marked for installation
	fi
fi

exit 1 # do not display task