This file is indexed.

/usr/share/glib-2.0/schemas/org.gnome.desktop.thumbnail-cache.gschema.xml is in gsettings-desktop-schemas 3.28.0-1ubuntu1.

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="UTF-8"?>
<schemalist gettext-domain="gsettings-desktop-schemas">
  <schema id="org.gnome.desktop.thumbnail-cache" path="/org/gnome/desktop/thumbnail-cache/">
    <key name="maximum-age" type="i">
      <default>180</default>
      <description>Maximum age for thumbnails in the cache, in days. Set to -1 to disable cleaning.</description>
    </key>
    <key name="maximum-size" type="i">
      <default>512</default>
      <description>Maximum size of the thumbnail cache, in megabytes. Set to -1 to disable cleaning.</description>
    </key>
  </schema>
</schemalist>