@Override
  public boolean containsEntry(RegionEntry entry) {
    return false;
  }
This implementation is for PrimaryKeyIndex. RangeIndex has its own implementation. For
PrimaryKeyIndex , this method should not be used
<p>
TODO: check if an Exception should be thrown if the function implementation of this class gets
invoked
geode-core/src/main/java/org/apache/geode/cache/query/internal/index/AbstractIndex.java