4cc9b300d4
The `FluxAggregatorMessageHandlerTests.testWindowTimespan()` relies on the time-based window function of `100` millis. Looks like a delay of `Thread.sleep(20)` may cause a resources race condition and window is released only with one item. * Disable `testWindowTimespan()` since there is no guarantee with what timing settings it is going to work stably **Cherry-pick to `5.5.x`**