title: How typeahead search should be done in vespa?
body: <p>I'm trying to build typeahead search using vespa. Since there is a lot of data, I don't want to use streaming mode. Wildcard search is something which I was expecting to see, but it looks restricted to streaming mode(Regular expressions and match:substring are applicable only for streaming mode). Any pointers on how to achieve it or customization will be appreciated. </p>