Task org.apache.jackrabbit.oak.commons.concurrent.NotifyingFutureTask@1a21a81a[Not completed, task = org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1@14e644f6] rejected from java.util.concurrent.ThreadPoolExecutor@1e1e2f86[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 2]