Task org.apache.jackrabbit.oak.commons.concurrent.NotifyingFutureTask@282e18e0[Not completed, task = org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1@22d67390] rejected from java.util.concurrent.ThreadPoolExecutor@67d4e9ae[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 4]