code: public java.util.Map<String, Double> getAdditionalVersionWeights() {
          if (additionalVersionWeights == null) {
              additionalVersionWeights = new com.amazonaws.internal.SdkInternalMap<String, Double>();
          }
          return additionalVersionWeights;
      }
docs: <p>
  The name of the second alias, and the percentage of traffic that's routed to it.
  </p>
  
  @return The name of the second alias, and the percentage of traffic that's routed to it.