This file is indexed.

/usr/share/dbus-1/interfaces/org.kde.khelpcenter.kcmhelpcenter.xml is in khelpcenter4 4:4.13.0-0ubuntu1.

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

The actual contents of the file can be viewed below.

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<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
"http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
  <interface name="org.kde.khelpcenter.kcmhelpcenter">
    <method name="slotIndexProgress"/>
    <method name="slotIndexError">
      <arg name="error" type="s" direction="in"/>
    </method>
    <signal name="buildIndexProgress"/>
    <signal name="buildIndexError">
      <arg name="buildIndexError" type="s" direction="out"/>
    </signal>
  </interface>
</node>