Autocomplete cache clear

It looks like when adding autocomplete results manually in Episerver Find 13, or when searching for a term and clicking a result, the autocomplete results returned from the search client are caching the list and we aren't seeing the new autocomplete items get returned by the search client until hours later. 

My 2 questions are:

1) What is the default duration on the autocomplete cache? 

2) Is there any way we can trigger a clear of the cache for autocomplete, or control the cache duration?

Thanks