This is makeindex, version 2.16 [TeX Live 2022] (kpathsea + Thai support).
Scanning input file tsvmman.idx....done (29 entries accepted, 0 rejected).
Sorting entries....done (142 comparisons).
Generating output file tsvmman.ind....done (62 lines written, 0 warnings).
Output written in tsvmman.ind.
Transcript written in tsvmman.ilg.