This file is indexed.

/usr/share/themes/Unity/index.theme is in gnome-themes-extras 2.22.0-3.

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

The actual contents of the file can be viewed below.

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[Desktop Entry]
Name=Unity
Type=X-GNOME-Metatheme
Comment=A smooth variation of the Clearlooks theme
Encoding=UTF-8

[X-GNOME-Metatheme]
GtkTheme=Unity
MetacityTheme=Unity
IconTheme=gnome-alternative