Task org.apache.jackrabbit.oak.commons.concurrent.NotifyingFutureTask@2ae64249[Not completed, task = org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1@2ed9c34a] rejected from java.util.concurrent.ThreadPoolExecutor@5233b9e0[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 7]