code: public static <T1, T2, T3, T4, T5, T6> Flux<Tuple6<T1, T2, T3, T4, T5, T6>> zip(Publisher<? extends T1> source1,
  			Publisher<? extends T2> source2,
  			Publisher<? extends T3> source3,
  			Publisher<? extends T4> source4,
  			Publisher<? extends T5> source5,
  			Publisher<? extends T6> source6) {
  		return zip(Tuples.fn6(), source1, source2, source3, source4, source5, source6);
  	}
docs: Zip six sources together, that is to say wait for all the sources to emit one
  element and combine these elements once into a {@link Tuple6}.
  The operator will continue doing so until any of the sources completes.
  Errors will immediately be forwarded.
  This "Step-Merge" processing is especially useful in Scatter-Gather scenarios.
  <p>
  <img class="marble" src="doc-files/marbles/zipFixedSourcesForFlux.svg" alt="">
  
  @param source1 The first upstream {@link Publisher} to subscribe to.
  @param source2 The second upstream {@link Publisher} to subscribe to.
  @param source3 The third upstream {@link Publisher} to subscribe to.
  @param source4 The fourth upstream {@link Publisher} to subscribe to.
  @param source5 The fifth upstream {@link Publisher} to subscribe to.
  @param source6 The sixth upstream {@link Publisher} to subscribe to.
  @param <T1> type of the value from source1
  @param <T2> type of the value from source2
  @param <T3> type of the value from source3
  @param <T4> type of the value from source4
  @param <T5> type of the value from source5
  @param <T6> type of the value from source6
  
  @return a zipped {@link Flux}