Minor fix on index.jsp

tomcat/webapps/Trawl/index.jsp

@@ -18,6 +18,9 @@
     <script src="map.js"></script>
     <script src="infoWindow.js"></script>
     <script src="infoGenerator.js"></script>
+    
+    <script src="cluster.js"></script>
+   
 
     <link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">