docs: public UpdateEndpointGroupRequest withEndpointConfigurations(EndpointConfiguration... endpointConfigurations) {
          if (this.endpointConfigurations == null) {
              setEndpointConfigurations(new java.util.ArrayList<EndpointConfiguration>(endpointConfigurations.length));
          }
          for (EndpointConfiguration ele : endpointConfigurations) {
              this.endpointConfigurations.add(ele);
          }
          return this;
      }