This file is indexed.

/lib/recovery-mode/options/root is in friendly-recovery 0.2.38.

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

. /lib/recovery-mode/l10n.sh

if [ "$1" = "test" ]; then
  if [ "$2" = "mode" ]; then
    exit 2
  fi
  echo $(eval_gettext "Drop to root shell prompt")
  exit 0
fi

/sbin/sulogin