private FlushResult internalFlushcache(MonitoredTask status) throws IOException {
    return internalFlushcache(stores.values(), status, false, FlushLifeCycleTracker.DUMMY);
  }
Flushing all stores.
@see #internalFlushcache(Collection, MonitoredTask, boolean, FlushLifeCycleTracker)
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java