This file is indexed.

/usr/share/glib-2.0/schemas/org.gnome.shell.extensions.mailnag.gschema.xml is in gnome-shell-mailnag 3.16.0-1.

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" encoding="UTF-8"?>
<schemalist gettext-domain="mailnag-gnome-shell">
   <schema path="/org/gnome/shell/extensions/mailnag/" id="org.gnome.shell.extensions.mailnag">
    <key type="b" name="show-avatars">
      <default>true</default>
      <summary>Show avatars</summary>
      <description>Show avatars in the indicator mail list (if available)</description>
    </key>
    <key type="i" name="max-visible-mails">
      <default>10</default>
      <summary>Maximum number of visible mails</summary>
      <description>Maximum number of mails listed in notifications and panel indicator</description>
    </key>
  </schema>
</schemalist>