This is makeindex, version 2.15 [TeX Live 2021] (kpathsea + Thai support).
Scanning style file ./manual.mst................done (16 attributes redefined, 0 ignored).
Scanning input file manual.idl....done (309 entries accepted, 0 rejected).
Sorting entries.....done (2747 comparisons).
Generating output file manual.ind....done (330 lines written, 0 warnings).
Output written in manual.ind.
Transcript written in manual.ilg.
