@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(endpoint_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, endpoint_);
    }
    if (((bitField0_ & 0x00000001) != 0)) {
      output.writeMessage(2, getDeployedModel());
    }
    if (((bitField0_ & 0x00000002) != 0)) {
      output.writeMessage(4, getUpdateMask());
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Required. The update mask applies to the resource. See
[google.protobuf.FieldMask][google.protobuf.FieldMask].
</pre>

<code>.google.protobuf.FieldMask update_mask = 4 [(.google.api.field_behavior) = REQUIRED];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/MutateDeployedModelRequest.java