@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(operator_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, operator_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(tag_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, tag_);
    }
    if (registry_ != com.google.cloud.visionai.v1.Registry.REGISTRY_UNSPECIFIED.getNumber()) {
      output.writeEnum(3, registry_);
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Optional. Registry of the operator.
</pre>

<code>
.google.cloud.visionai.v1.Registry registry = 3 [(.google.api.field_behavior) = OPTIONAL];
</code>

@return The registry.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/OperatorQuery.java