Clear TREX query cache

Hi all,
I'm stuck on this problem: I'm adding a document to a Trex search index using KM API (Web Dynpro for Java app). The document is processed & added to the index. So far so good.
The problem is that when I do a search on that index (I search for ''), the document won't show up because the query results of the previous search for '' on my index seem to be cached somewhere. When I wait for 10 mins (cache expires?) or when restart my Web Dynpro app (so the user needs to login again), the document is found.
How can I clear/disable the trex query cache?
Thanks a lot,
Jeroen
PS: clicking on the 'clear cache' button in Search and Classification Cache Administration (TREX monitor) is not working. The cache that is pestering me seems to be a session-specific query cache.

TREX service @ visual admin: queries.usecache == false

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