This file is indexed.

/usr/lib/tasksel/tests/server is in tasksel-data 3.31+deb8u1.

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

if ! [ "$NEW_INSTALL" ]; then
	exit 3
fi

/usr/lib/tasksel/tests/desktop
ret=$?
case $ret in
	0|2) # is desktop
		exit 3 # not server
	;;
	*)
		exit 2 # likely is server
	;;
esac