This file is indexed.

/usr/share/glib-2.0/schemas/org.gnome.desktop.thumbnailers.gschema.xml is in gsettings-desktop-schemas 3.22.0-1.

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"?>
<schemalist>
  <schema id="org.gnome.desktop.thumbnailers" path="/org/gnome/desktop/thumbnailers/">
    <key name="disable-all" type="b">
      <default>false</default>
      <summary>Disable all external thumbnailers</summary>
      <description>
        Set to true to disable all external thumbnailer programs,
        independent on whether they are independently disabled/enabled.
      </description>
    </key>

    <key name="disable" type="as">
      <default>[]</default>
      <summary>
        List of mime-types for which external thumbnailer
        programs will be disabled
      </summary>
      <description>
        Thumbnails will not be created for files whose mime-type is
        contained in the list.
      </description>
    </key>
  </schema>
</schemalist>