This file is indexed.

/usr/share/xscreensaver/config/interaggregate.xml is in xscreensaver-data-extra 5.15-2ubuntu1.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<screensaver name="interaggregate" _label="Interaggregate">

  <command arg="-root"/>

  <number id="speed" type="slider" arg="-growth-delay %"
          _label="Frame rate" _low-label="Low" _high-label="High"
          low="0" high="100000" default="18000" convert="invert"/>

  <number id="init" type="slider" arg="-num-circles %"
          _label="Number of discs" _low-label="Few" _high-label="Many"
           low="50" high="400" default="100"/>

  <boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>

  <_description>
A surface is filled with a hundred medium to small sized circles.
Each circle has a different size and direction, but moves at the same
slow rate.  Displays the instantaneous intersections of the circles as
well as the aggregate intersections of the circles.

Though actually it doesn't look like circles at all!

Written by Casey Reas, William Ngan, Robert Hodgin, and Jamie Zawinski; 2004.
  </_description>
</screensaver>