This file is indexed.

/etc/texmf/hyphen.d/00tex.cnf is in tex-common 2.10.

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

The actual contents of the file can be viewed below.

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%
% The first entries in language.dat and language.def have to be
% for english/USenglish to ensure total document portability.
%