Index moves the text to index

Question

Here is the file I am working with.

\documentclass[12pt,a4paper]{book}
\usepackage{xkeyval}
\usepackage{polyglossia}
\usepackage{xcolor}
\usepackage{makeidx}
\usepackage{multicol}

\setmainfont[Script=Devanagari]{Sanskrit 2003}
 \makeindex
\begin{document}
\printindex

\chapter*{प्रथमाध्यायः}


\index{धर्मक्षेत्रे कुरुक्षेत्रे} समवेता युयुत्सव: । \\
मामका: पाण्डावश्चैव किमकुर्वत सञ्जय ॥ १ ॥
\end{document}

In the above example I want the first two words of the verse to appear in index, it does appear in the index but its deleted from the verse. Am I doing something wrong.

Answer 1

You're not doing anything wrong, that's the default behaviour.

A solution is to use the index package instead of makeidx and use the starred \index macro provided by that package. This prints the word(s) in both text and index.

\documentclass[12pt,a4paper]{book}
\usepackage{xkeyval}
\usepackage{polyglossia}
\usepackage{xcolor}
\usepackage{index}
\usepackage{multicol}

\setmainfont[Script=Devanagari]{Sanskrit 2003}
 \makeindex
\begin{document}
\printindex

\chapter*{प्रथमाध्यायः}


\index*{धर्मक्षेत्रे कुरुक्षेत्रे}
धर्मक्षेत्रे कुरुक्षेत्रे समवेता युयुत्सव: । \\
मामका: पाण्डावश्चैव किमकुर्वत सञ्जय ॥ १ ॥
\end{document}

Answer 2

The argument to \index is independent of the text of your document. Thus if you want to index an item which is also in the text, you either need to repeat it

\documentclass[12pt,a4paper]{book}
\usepackage{xkeyval}
\usepackage{polyglossia}
\usepackage{xcolor}
\usepackage{makeidx}
\usepackage{multicol}

\setmainfont[Script=Devanagari]{Sanskrit 2003}
 \makeindex
\begin{document}
\printindex

\chapter*{प्रथमाध्यायः}


\index{धर्मक्षेत्रे कुरुक्षेत्रे}%
धर्मक्षेत्रे कुरुक्षेत्रे समवेता युयुत्सव: । \\
मामका: पाण्डावश्चैव किमकुर्वत सञ्जय ॥ १ ॥
\end{document}

or define a custom command to do this 'behind the scenes':

\documentclass[12pt,a4paper]{book}
\usepackage{xkeyval}
\usepackage{polyglossia}
\usepackage{xcolor}
\usepackage{makeidx}
\usepackage{multicol}

\setmainfont[Script=Devanagari]{Sanskrit 2003}
 \makeindex
\newcommand\alsoindex[1]{\index{#1}#1}
\begin{document}
\printindex

\chapter*{प्रथमाध्यायः}


\alsoindex{धर्मक्षेत्रे कुरुक्षेत्रे}
धर्मक्षेत्रे कुरुक्षेत्रे समवेता युयुत्सव: । \\
मामका: पाण्डावश्चैव किमकुर्वत सञ्जय ॥ १ ॥
\end{document}

The \index command is a bit odd as it does various verbatim-like tricks, but for simple text the approach of a wrapper should work.