This file is indexed.

/etc/texmf/fmt.d/10texlive-xetex.cnf is in texlive-xetex 2014.20141024-2+deb8u1.

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# 10texlive-xetex.cnf
# You can change/add entries to this file and changes will be preserved
# over upgrades, even if you have removed the main package prior
# (not if you purged it). You should leave the following pseudo comment
# present in the file!
# -_- DebPkgProvidedMaps -_-
# 
xelatex xetex language.dat -etex xelatex.ini
xetex xetex language.def -etex xetex.ini