Add beta tag to Elasticsearch (#7121)

* make Elasticsearch beta

* make Elasticsearch beta

* make Elasticsearch beta

webapp/components/admin_console/admin_sidebar.jsx

@@ -266,7 +266,7 @@ export default class AdminSidebar extends React.Component {
                     title={
                         <FormattedMessage
                             id='admin.sidebar.elasticsearch'
-                            defaultMessage='Elasticsearch'
+                            defaultMessage='Elasticsearch (Beta)'
                         />
                     }
                 />