This file is indexed.

/usr/share/xindy/base/letter-order.xdy is in xindy-rules 2.4-1.1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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;; $Id: letter-order.xdy,v 1.1 2004/05/24 21:53:27 jschrod Exp $
;;------------------------------------------------------------

;;;
;;; letter order scheme
;;;
;;; spaces are ignored, "index style" is sorted after "indexing".
;;;

(sort-rule " " "")


;;======================================================================
;;
;; $Log: letter-order.xdy,v $
;; Revision 1.1  2004/05/24 21:53:27  jschrod
;;     Standard modules, introduced in "LaTeX Companion Release".
;;