@Override
  public int size() {
    return hashIndexSetProperties.size;
  }
Returns the number of positions used in the backing array Is not a true representation of the
number of elements in the array as the array may contain REMOVED tokens

@return an <code>int</code> value
geode-core/src/main/java/org/apache/geode/cache/query/internal/index/HashIndexSet.java