code: public void _include(IncludeBuilderBase includes) {
          if (includes == null) {
              return;
          }
  
          if (includes.documentsToInclude != null) {
              for (String doc : includes.documentsToInclude) {
                  documentIncludes.add(doc);
              }
          }
  
          _includeCounters(includes.alias, includes.countersToIncludeBySourcePath);
      }
docs: TBD expr public void Include(Expression<Func<T, object>> path)