nixos/logstash: Listen on 127.0.0.1 instead of 0.0.0.0

nixos/doc/manual/release-notes/rl-1803.xml

···
       must be set to true.
     </para>
   </listitem>
+  <listitem>
+    <para>
+      The option <option>services.logstash.listenAddress</option> is now <literal>127.0.0.1</literal> by default.
+      Previously the default behaviour was to listen on all interfaces.
+    </para>
+  </listitem>
 </itemizedlist>
 
 </section>

nixos/modules/services/logging/logstash.nix

···
 
       listenAddress = mkOption {
         type = types.str;
-        default = "0.0.0.0";
+        default = "127.0.0.1";
         description = "Address on which to start webserver.";
       };