code: public <U> BaseSimpleReactStream<U> fromStream(final Stream<CompletableFuture<U>> stream) {
  
          final Stream s = stream;
          return construct(s);
      }
docs: Start a reactive dataflow from a stream of CompletableFutures.
  
  @param stream of CompletableFutures that will be used to drive the reactive dataflow
  @return Next stage in the reactive flow