@Override
  public RealizationResult update(Region config, InternalCache cache) {
    throw new NotImplementedException("Not implemented");
  }
the default implementation will have the extra work of getting the runtime info which is
unnecessary. It will also have some concurrency issue if the region is being destroyed.
geode-core/src/main/java/org/apache/geode/management/internal/configuration/realizers/RegionConfigRealizer.java