This file is indexed.

/usr/bin/mkindex is in texlive-binaries 2015.20160222.37495-1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

test -f /bin/sh5 && test -z "$RUNNING_SH5" \
  && { UNAMES=`uname -s`; test "x$UNAMES" = xULTRIX; } 2>/dev/null \
  && { RUNNING_SH5=true; export RUNNING_SH5; exec /bin/sh5 $0 ${1+"$@"}; }
unset RUNNING_SH5

test -f /bin/bsh && test -z "$RUNNING_BSH" \
  && { UNAMES=`uname -s`; test "x$UNAMES" = xAIX; } 2>/dev/null \
  && { RUNNING_BSH=true; export RUNNING_BSH; exec /bin/bsh $0 ${1+"$@"}; }
unset RUNNING_BSH

progname=`basename $0`
case $# in
  0) 
    echo "usage: `basename $0` file[.idx] ..." 1>&2
    exit 1
    ;;
esac

gind=gind.ist
gglo=gglo.ist

# remember starting directory
dir=`pwd`

# loop over all files
for i
do
  destdir=`echo $i | sed 's/^[^\/]*$/./; s/\/[^\/]*$//'`
  test -d "$destdir"||continue
  cd "$destdir"
  FILENAME=`basename $i .idx`
  test -f "$FILENAME".idx \
    && makeindex -s $gind "$FILENAME"
  test -f "$FILENAME".glo \
    && makeindex -s $gglo -o "$FILENAME".gls "$FILENAME".glo
  cd "$dir"
done