This file is indexed.

/usr/share/gconf/ubuntu-2d.mandatory.path is in unity-2d-common 5.10.0-0ubuntu1.

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

The actual contents of the file can be viewed below.

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# Additional mandatory path for ubuntu-2d experience
xml:readonly:/var/lib/gconf/ubuntu-2d.mandatory