ejs additions

I was unable to use a lucene query string to make a start_with query on a **not_analyzed** HTTP request string field like `request:/service/action*` successfully.
Maybe I missed something in the syntax or in the documentation. 
But I found that I could use the ES wildcard query and prefix filter.

This PR add the requires ejs code to use them.

I edited the configuration in the dashboard json, 
sorry I don't have time to make an editor panel for the query