This file is indexed.

/etc/texmf/texmf.d/20xmltex.cnf is in xmltex 1.9.debian.1-2.

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

The actual contents of the file can be viewed below.

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% Settings for Debian xmltex
TEXINPUTS.pdfxmltex = .;$TEXMF/tex/{xmltex,latex,plain,generic,}//