@Override
  public boolean isDestroyed() {
    return regionEntry.isDestroyedOrRemoved();
  }
Returns the entry's RegionEntry if it "checks" out. The check is to see if the region entry
still exists.

@throws EntryNotFoundException if the RegionEntry has been removed.
geode-core/src/main/java/org/apache/geode/internal/cache/ExpiryRegionEntry.java