public static void fixUnassigned(Admin admin, RegionInfo region)
    throws IOException, KeeperException, InterruptedException {
    // Force ZK node to OFFLINE so master assigns
    forceOfflineInZK(admin, region);
  }
Fix unassigned by creating/transition the unassigned ZK node for this region to OFFLINE state
with a special flag to tell the master that this is a forced operation by HBCK. This assumes
that info is in META.
hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsckRepair.java