This is makeindex, version 2.15 [TeX Live 2013] (kpathsea + Thai support).
Scanning input file Convex.idx....done (58 entries accepted, 0 rejected).
Sorting entries....done (367 comparisons).
Generating output file Convex.ind....done (113 lines written, 0 warnings).
Output written in Convex.ind.
Transcript written in Convex.ilg.