code: private CompletableFuture<List<EpochRecord>> getEpochRecords(String scope, String stream, int epoch, OperationContext context) {
          List<CompletableFuture<EpochRecord>> list = new ArrayList<>();
          list.add(streamMetadataStore.getEpoch(scope, stream, epoch, context, executor));
          list.add(streamMetadataStore.getActiveEpoch(scope, stream, context, true, executor));
          return Futures.allOfWithResults(list);
      }
docs: Fetches epoch history records for active epoch and the supplied `epoch` from the store.