docs: public CreateClusterRequest withIamRoles(String... iamRoles) {
          if (this.iamRoles == null) {
              setIamRoles(new com.amazonaws.internal.SdkInternalList<String>(iamRoles.length));
          }
          for (String ele : iamRoles) {
              this.iamRoles.add(ele);
          }
          return this;
      }