docs: public static PartitionAccumulatorRegistry getAccumulatorRegistryOrNull(QueryCacheContext context,
                                                                              String mapName, String cacheId) {
          PublisherContext publisherContext = context.getPublisherContext();
          MapPublisherRegistry mapPublisherRegistry = publisherContext.getMapPublisherRegistry();
          PublisherRegistry publisherRegistry = mapPublisherRegistry.getOrNull(mapName);
          if (publisherRegistry == null) {
              return null;
          }
          return publisherRegistry.getOrNull(cacheId);
      }