This method will do its best to expedite the shutdown process. In particular, all connections will be closed right away, even if there is ongoing queries at the time this method is called.
Note that this method does not block. The completion of this method does not imply the shutdown process is done, you still need to wait on this future to ensure that, but calling this method will ensure said future will return in a timely way. @return this {@code CloseFuture}.
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