I didn't think the existing one would fit the UI. This is what this one looks like: http://htmlpreview.github.io/?https://gist.github.com/yjbanov/8638120/raw/8df6d4ab83ede8859f8dcdf45bb2d4c54f1ffb3b/spark-loading-indicator.html

Anyway it's not visible for the SearchOracle because it is synchronous. I tested it by artificially putting it inside a Future.delayed.