@Override
  public OperationCallable<CreateConnectorRequest, Connector, OperationMetadata>
      createConnectorOperationCallable() {
    return createConnectorOperationCallable;
  }
Constructs an instance of HttpJsonVpcAccessServiceStub, using the given settings. This is
protected so that it is easy to make a subclass, but otherwise, the static factory methods
should be preferred.
java-vpcaccess/google-cloud-vpcaccess/src/main/java/com/google/cloud/vpcaccess/v1/stub/HttpJsonVpcAccessServiceStub.java