public Builder setUpdateCustomClassRequest(
        com.google.cloud.speech.v2.UpdateCustomClassRequest value) {
      if (updateCustomClassRequestBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        request_ = value;
        onChanged();
      } else {
        updateCustomClassRequestBuilder_.setMessage(value);
      }
      requestCase_ = 14;
      return this;
    }
<pre>
The UpdateCustomClassRequest that spawned the Operation.
</pre>

<code>.google.cloud.speech.v2.UpdateCustomClassRequest update_custom_class_request = 14;
</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/OperationMetadata.java