@java.lang.Override
    public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
      if (((bitField0_ & 0x00000001) != 0)) {
        output.writeMessage(1, getUpdateMask());
      }
      if (((bitField0_ & 0x00000002) != 0)) {
        output.writeMessage(2, getInstance());
      }
      if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(instanceId_)) {
        com.google.protobuf.GeneratedMessageV3.writeString(output, 3, instanceId_);
      }
      getUnknownFields().writeTo(output);
    }
<pre>
Required. The id of the instance.
</pre>

<code>string instance_id = 3 [(.google.api.field_behavior) = REQUIRED];</code>

@return The bytes for instanceId.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/UpdateApplicationInstancesRequest.java