updated to the latest API, which moves the experimental benchmark API (in the unreleased API versions master and 1.x) and includes a new indices.updateAliases example. Closes #83

docs/_examples/indices.updateAliases.asciidoc

@@ -0,0 +1,14 @@
+.Perform an atomic alias swap, for a rotating index
+[source,js]
+---------
+client.indices.updateAliases({
+  body: {
+    actions: [
+      { remove: { index: 'logstash-2014.04', alias: 'logstash-current' } },
+      { add:    { index: 'logstash-2014.05', alias: 'logstash-current' } }
+    ]
+  }
+}).then(function (response) {
+  // ...
+}, errorHandler);
+---------