added generation steps for all file which list api versions

scripts/generate/templates/docs_index.tmpl

@@ -0,0 +1,34 @@
+= elasticsearch.js
+
+include::about.asciidoc[]
+
+include::browser_builds.asciidoc[]
+
+include::quick_start.asciidoc[]
+
+include::api_conventions.asciidoc[]
+
+include::configuration.asciidoc[]
+
+include::ssl_authentication.asciidoc[]
+
+include::extending_core_components.asciidoc[]
+
+include::logging.asciidoc[]
+
+include::development.asciidoc[]
+
+<%
+
+apiFiles.forEach(function (file, i) {
+  if (i > 0) print('\n');
+
+  print('include::' + file + '[]\n');
+});
+
+%>
+include::host.asciidoc[]
+
+include::transport.asciidoc[]
+
+include::errors.asciidoc[]