Creates Future instance aware of current request and session.
Creates Future instance aware of current request and session. Each Future returned by chained
transformation method (e.g. map, flatMap) will be also request/session-aware. However, it's
important to bear in mind that initial request and session are not propagated to chained methods.
It's required that current execution thread for chained method has its own request/session available
if reading/writing some data to it as a part of chained method execution.