Task org.apache.jackrabbit.oak.commons.concurrent.NotifyingFutureTask@6e1d1b4a[Not completed, task = org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1@6a2292d6] rejected from java.util.concurrent.ThreadPoolExecutor@2b1f98ed[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 5]