This is makeindex, version 2.15 [TeX Live 2020] (kpathsea + Thai support).
Scanning style file ./python.ist.......done (7 attributes redefined, 0 ignored).
Scanning input file trustedfirmware-a.idx....done (69 entries accepted, 0 rejected).
Sorting entries....done (370 comparisons).
Generating output file trustedfirmware-a.ind....done (129 lines written, 0 warnings).
Output written in trustedfirmware-a.ind.
Transcript written in trustedfirmware-a.ilg.