This file is indexed.

/usr/share/glib-2.0/schemas/org.gnome.evolution.plugin.email-custom-header.gschema.xml is in evolution-common 3.12.9~git20141130.241663-1.

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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/evolution/plugin/email-custom-header/" id="org.gnome.evolution.plugin.email-custom-header" gettext-domain="evolution">
    <key type="as" name="custom-header">
      <default>['Security=Personal;Unclassified;Protected;InConfidence;Secret;Topsecret']</default>
      <summary>List of Custom Headers</summary>
      <description>The key specifies the list of custom headers that you can add to an outgoing message. The format for specifying a Header and Header value is: Name of the custom header followed by "=" and the values separated by ";"</description>
    </key>
  </schema>
</schemalist>