Task org.apache.jackrabbit.oak.commons.concurrent.NotifyingFutureTask@60d7ffa9[Not completed, task = org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1@64e877ec] rejected from java.util.concurrent.ThreadPoolExecutor@12eaf6dc[Shutting down, pool size = 1, active threads = 1, queued tasks = 0, completed tasks = 42]