@Override
  DiskRegion createDiskRegion(InternalRegionArguments internalRegionArgs)
      throws DiskAccessException {
    if (internalRegionArgs.getDiskRegion() != null) {
      return internalRegionArgs.getDiskRegion();
    } else {
      return null;
    }
  }
Used to get membership events from our advisor to implement RegionMembershipListener
invocations. This is copied almost in whole from DistributedRegion

@since GemFire 5.7
geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegion.java