Task org.apache.jackrabbit.oak.commons.concurrent.NotifyingFutureTask@4e02d83e[Not completed, task = org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1@4a3d45a1] rejected from java.util.concurrent.ThreadPoolExecutor@3d6c7a53[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 2]