Task org.apache.jackrabbit.oak.commons.concurrent.NotifyingFutureTask@496f3050[Not completed, task = org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1@4d50bd22] rejected from java.util.concurrent.ThreadPoolExecutor@c6db719[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 4]