% arara: pdflatex
% arara: pdflatex
% arara: makeindex: { style: myright, files: [ add.idx, mul.idx ] }
% arara: pdflatex
% arara: clean: { files: [ add.idx, add.ilg, add.ind, mul.idx, mul.ilg, mul.ind ] }
\begin{filecontents*}{myright.ist}
% MakeIndex style file; page numbers flushed right and dot leaders
% between entries and page numbers
delim_0 "\\dotfill "
delim_1 "\\dotfill "
delim_2 "\\dotfill "
\end{filecontents*}
\documentclass{article}
\usepackage{amsthm}
\usepackage[noautomatic]{imakeidx}