private TransitRegionStateProcedure[] createUnassignProcedures(MasterProcedureEnv env)
    throws IOException {
    return AssignmentManagerUtil.createUnassignProceduresForSplitOrMerge(env,
      Stream.of(getParentRegion()), getRegionReplication(env));
  }
Post split region actions
@param env MasterProcedureEnv
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/SplitTableRegionProcedure.java