code: public boolean serveIndexJelly(StaplerRequest req, StaplerResponse rsp, Object node) throws ServletException, IOException {
          try {
              Script script = findScript("index.jelly");
              if(script!=null) {
                  String src = "index.jelly";
                  if (script instanceof JellyViewScript) {
                      JellyViewScript jvs = (JellyViewScript) script;
                      src = jvs.getName();
                  }
                  Dispatcher.anonymizedTraceEval(req, rsp, node, "%s: Jelly index: %s", src);
                  if(traceable()) {
                      trace(req,rsp,"-> %s on <%s>",src,node);
                  }
                  facet.scriptInvoker.invokeScript(req, rsp, script, node);
                  return true;
              }
              return false;
          } catch (JellyException e) {
              throw new ServletException(e);
          }
      }
docs: Serves <tt>index.jelly</tt> if it's available, and returns true.