This file is indexed.

/usr/share/xindy/lang/czech/cp1250-lang.xdy is in xindy-rules 2.4-1.3.

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

The actual contents of the file can be viewed below.

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(require "lang/czech/cp1250.xdy")
(define-sort-rule-orientations (forward backward forward forward))
(use-rule-set :run 0
	      :rule-set ("cs-alphabetize" "cs-ignore-special"))
(use-rule-set :run 1
	      :rule-set ("cs-resolve-diacritics" "cs-ignore-special"))
(use-rule-set :run 2
	      :rule-set ("cs-resolve-case" "cs-ignore-special"))
(use-rule-set :run 3
	      :rule-set ("cs-resolve-special"))