Note on test data and required index pattern

Author: guyplusplus

README.md

@@ -2,7 +2,7 @@
 
 This project is a simple tutorial for Kibana new comers trying to develop their own vizualisation plugin. The actual usecase of this plugin is to create a custom data input form, where fields are used to filter data used by other visualizations in the dashboard.
 
-This plugin is a demo based on the accounts data which can be downloaded from Elastic web site [here](https://download.elastic.co/demos/kibana/gettingstarted/accounts.zip).
+This plugin is a demo based on the accounts data which can be downloaded from Elastic web site [here](https://download.elastic.co/demos/kibana/gettingstarted/accounts.zip). To work, the index pattern for bank data shall be called `bank*` as it is hard coded in `custom_form_filter_accounts_vis_controller.tsx`.
 
 As plugin architecture is being under heavy redesign in 7.x and documentation is rather obscure, I did my best to create something simple that works. The code is also basic, I am a JavaScript beginner!