This file is indexed.

/usr/share/glib-2.0/schemas/org.gnome.desktop.search-providers.gschema.xml is in gsettings-desktop-schemas 3.10.1-0ubuntu1.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<schemalist>
  <schema path="/org/gnome/desktop/search-providers/" id="org.gnome.desktop.search-providers">

    <key type="b" name="disable-external">
      <default>false</default>
      <summary>Disable all external search providers</summary>
      <description>Set to true to disable all external search provider programs, whether or not they are independently disabled or enabled. External search providers are installed by applications in $XDG_DATA_DIR/gnome-shell/search-providers.</description>
    </key>

    <key type="as" name="disabled">
      <default>[]</default>
      <summary>List of desktop file IDs for which search provider should be disabled</summary>
      <description>Results for applications contained in this list will not be displayed when searching.</description>
    </key>

    <key type="as" name="sort-order">
      <default>['gnome-contacts.desktop', 'gnome-documents.desktop', 'nautilus.desktop']</default>
      <summary>List of desktop file IDs for search providers sort order</summary>
      <description>Results for applications contained in this list will be displayed in the specified order. Results for applications not specified in this list will be displayed last, sorted alphabetically.</description>
    </key>

  </schema>
</schemalist>