This file is indexed.

/etc/gss/mech.d/README is in libgssapi-krb5-2 1.13.2+dfsg-5.

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

The actual contents of the file can be viewed below.

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Any file places in this directory ending in .conf will be read as a
GSS-API mechanism configuration file, and the mechanisms described in
that file will be dynamically loaded.