This is makeindex, version 2.15 [TeX Live 2019/dev] (kpathsea + Thai support).
Scanning input file CoursMecaniqueOSDF.idx.....done (1213 entries accepted, 0 rejected).
Sorting entries............done (13289 comparisons).
Generating output file CoursMecaniqueOSDF.ind.....done (910 lines written, 0 warnings).
Output written in CoursMecaniqueOSDF.ind.
Transcript written in CoursMecaniqueOSDF.ilg.