@Override
  public DiskEntry getDiskEntry(Object key) {
    RegionEntry re = getRecoveredEntryMap().getEntry(key);
    if (re != null && re.isRemoved() && !re.isTombstone()) {
      re = null;
    }
    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