In the HTTP API, there is the option to add "x-arango-async: store" to the headers so that a query can be run asynchronously, in the sense that a job id is returned and results can be fetched later. Is this option also possible through the Java API? I understand that the API already has Java futures, but I would not like my app to have many background threads waiting for results on queries. Would it be possible to have the API return just a future of a job id, which the client can reference at a later time to fetch the results?