code: Future<AggregatorConfiguration> getAggregationConfiguration() {
          return new HAConfFuture<>(invokeSubServiceConfUpdates(),
                  new HAConfFuture.ConfResultSupplier<ConsolidatedResult<AggregatorConfiguration>>() {
                      public ConsolidatedResult<AggregatorConfiguration> get() {
                          return lastConsolidatedConfiguration;
                      }
                  });
      }
docs: Gets the aggregator's configuration. Invokes configuration updates for all the subclients.
  
  @return {@link Future} which eventually provides subconfiguration's consolidation result.