docs: public UpdateDomainAssociationRequest withSubDomainSettings(SubDomainSetting... subDomainSettings) {
          if (this.subDomainSettings == null) {
              setSubDomainSettings(new java.util.ArrayList<SubDomainSetting>(subDomainSettings.length));
          }
          for (SubDomainSetting ele : subDomainSettings) {
              this.subDomainSettings.add(ele);
          }
          return this;
      }