partial         void CopyExtraPropertiesToClone(IndexMetadata clone, bool includeLocalProperties);
 public IndexMetadata Clone(bool includeLocalProperties)
 {
     var c = new IndexMetadata
             {
                 IndexName = IndexName,
                 IsPresentable = IsPresentable,
                 SupportedTypes = SupportedTypes.ToList(),
             };
     CopyExtraPropertiesToClone(c, includeLocalProperties);
     return c;
 }