docs: public DescribeActivationsResult withActivationList(Activation... activationList) {
          if (this.activationList == null) {
              setActivationList(new com.amazonaws.internal.SdkInternalList<Activation>(activationList.length));
          }
          for (Activation ele : activationList) {
              this.activationList.add(ele);
          }
          return this;
      }