@Override
  public DiskEntry initializeRecoveredEntry(Object key, DiskEntry.RecoveredEntry value) {
    RegionEntry re = getRecoveredEntryMap().initRecoveredEntry(key, value);
    if (re == null) {
      throw new InternalGemFireError(
          String.format("Entry already existed: %s", key));
    }
    return (DiskEntry) re;
  }
This constructor is used when we are closing an existing region. We want to remember that it is
still present in the disk store.
geode-core/src/main/java/org/apache/geode/internal/cache/PlaceHolderDiskRegion.java