This file is indexed.

/usr/share/debian-reference-common/mkindexhtml is in debian-reference-common 2.68.

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 -e

TITLE="Debian Reference (version 2)"
PACKAGE="debian-reference" # Yes this has been changed
DOC_ROOT=${DOC_ROOT:-/usr/share/debian-reference}
README="/usr/share/doc/debian-reference-common/README"

# Echo Language name
echolang () {
  case "$1" in
    "en") echo "<dt><b>English</b></dt>";;
    "fr") echo "<dt><b>French</b></dt>";;
    "it") echo "<dt><b>Italian</b></dt>";;
    "es") echo "<dt><b>Spanish</b></dt>";;
    "de") echo "<dt><b>German</b></dt>";;
    "pl") echo "<dt><b>Polish</b></dt>";;
    "pt") echo "<dt><b>Portuguese (Portugal)</b></dt>";;
    "pt-br") echo "<dt><b>Portuguese (Brazil)</b></dt>";;
    "zh-tw") echo "<dt><b>Chinese (Traditional)</b></dt>";;
    "zh-cn") echo "<dt><b>Chinese (Simplified)</b></dt>";;
    "ja") echo "<dt><b>Japanese</b></dt>";;
     *) echo "<dt>$1</dt>";;
  esac
}

# Echo index page
echoindex () {
echo "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\">" 
echo "<html>" 
echo "<head>" 
echo "<meta http-equiv=\"content-type\" content=\"text/html; charset=utf-8\">"
echo "<title>${TITLE}</title>" 
echo "</head>" 
echo "<body>" 
echo "<hr>" 
echo "<h1>${TITLE}</h1>" 
if [ -n "${LANGS}" ]; then
  echo "<hr>" 
  echo "<p>" 
  echo "<dl>" 
  for lang in ${LANGS}; do
    echolang "$lang"
    echo "<dd>"
    echo "<a href=\"index.$lang.html\">HTML (multi files)</a>"
    if [ -f $PACKAGE.$lang.html ]; then
      echo ", <a href=\"$PACKAGE.$lang.html\">HTML (single file)</a>"
    fi
    if [ -f $PACKAGE.$lang.txt.gz ]; then
      echo ", <a href=\"$PACKAGE.$lang.txt.gz\">UTF-8 plain text (gzipped)</a>"
    elif [ -f $PACKAGE.$lang.txt ]; then
      echo ", <a href=\"$PACKAGE.$lang.txt\">UTF-8 plain text</a>"
    fi
    if [ -f $PACKAGE.$lang.epub ]; then
      echo ", <a href=\"$PACKAGE.$lang.epub\">epub</a>"
    fi
#    echo ", <a href=\"$PACKAGE.$lang.ps.gz\">PS</a>"
    echo ", <a href=\"$PACKAGE.$lang.pdf\">PDF</a>"
    echo "</dd>"
  done
  echo "</dl>"
  echo "</p>"
fi
echo "<hr>" 
echo "<p>All files are encoded in <b>UTF-8</b>.</p>"
#echo "<p>HTML (single) file format is provided as substitute for PS/PDF format for full text search.</p>"
#echo "<p>All contents are now in version 2 series based on XML source.</p>"
#echo "<p>The old translated contents in German, Spanish, Polish, Portuguese (Brazil), Chinese (Traditional), and Chinese (Simplified) are available as squeeze packages.  </p>"
echo "<p>If your favorite language is not found in this list, please install the corresponding <tt>debian-reference-*</tt> package.</p>"
echo "<p>Some browsers may not be setup to read compressed plain text. Use appropriate file viewer system to read them directly from <a href=\"$DOC_ROOT\">$DOC_ROOT</a>. See <a href=\"$README\">README<a> for more help and information.</p>"
echo "</body>" 
echo "</html>"
}

# Always remove index page and move to the $DOC_ROOT directory
if [ -d $DOC_ROOT ]; then
  cd $DOC_ROOT
  # index.html can be symlink or file
  rm -f index.html
else
  # You may have removed the $DOC_ROOT directory
  exit 0
fi
# Always sort language with English as top.
LANGS="$(ls -1 --color=never index.*.html 2> /dev/null | \
	sed 's/index\.//g;s/\.html//g;s/en/00/' | \
	sort | sed 's/00/en/')"

HTML_INSTALLED=$(echo "${LANGS}" | wc -w)

# Create single index page for menu:
if [ $HTML_INSTALLED = 0 ]; then
  # remove index file only
  # keep images/ and debian-reference.css
  rm -f index.html
##elif [ $HTML_INSTALLED = 1 ]; then
##  # one file only, link it
##  ln -sf index.*.html index.html
else
  echoindex > index.html
fi

exit 0