Task org.apache.jackrabbit.oak.commons.concurrent.NotifyingFutureTask@7f30a891[Not completed, task = org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1@7b0f2328] rejected from java.util.concurrent.ThreadPoolExecutor@6134bbbb[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 5]