¿Cómo obtener la marca del índice?

Question

Quiero conseguir estos marcadores.

pero solo me sale esto:

¿Hay alguna manera de obtener este índice con los marcadores de la imagen?

\documentclass{book}
\usepackage[utf8]{inputenc}
\usepackage{imakeidx}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}
\usepackage[pdftex, bookmarksnumbered,  pagebackref, colorlinks=true, citecolor=Blue, linkcolor=DarkBlue!30!Black, urlcolor=Black,bookmarksopen]{hyperref}
\makeindex[columns=3, title=Alphabetical Index, intoc]

\begin{document}

\tableofcontents
\chapter*{Dedicatory}
   to all my family
\chapter*{Abstract}
   hello world
\chapter{chapter}
\section{Introduction}
In this example several keywords\index{keywords} will be 
used which are important and deserve to appear in the 
Index\index{Index}.
 \subsection{subsection}
Terms like generate\index{generate} and some\index{others} 
will also show up. Terms in the index can also be 
nested \index{Index!nested}

\clearpage

\section{Second section}
This second section\index{section} may include some special 
word, and expand the ones already used\index{keywords!used}.

\printindex
\end{document}

Answer 1

Puede agregarlos, por ejemplo, con pdfbookmark:

\documentclass{book}
\usepackage[utf8]{inputenc}
\usepackage{imakeidx}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}
\usepackage[pdftex, bookmarksnumbered,  pagebackref, colorlinks=true, citecolor=Blue, linkcolor=DarkBlue!30!Black, urlcolor=Black,bookmarksopen]{hyperref}
\makeindex[columns=3, title=Alphabetical Index, intoc]

\begin{document}

\tableofcontents

\cleardoublepage
\pdfbookmark{Dedicatory}{dedic}
\chapter*{Dedicatory}

   to all my family

\cleardoublepage
\pdfbookmark{Abstract}{abstr}

\chapter*{Abstract}

   hello world


\chapter{chapter}
\section{Introduction}
In this example several keywords\index{keywords} will be
used which are important and deserve to appear in the
Index\index{Index}.
 \subsection{subsection}
Terms like generate\index{generate} and some\index{others}
will also show up. Terms in the index can also be
nested \index{Index!nested}

\clearpage

\section{Second section}
This second section\index{section} may include some special
word, and expand the ones already used\index{keywords!used}.

\printindex
\end{document}