private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.speech.v2.CreateCustomClassRequest,
            com.google.cloud.speech.v2.CreateCustomClassRequest.Builder,
            com.google.cloud.speech.v2.CreateCustomClassRequestOrBuilder>
        getCreateCustomClassRequestFieldBuilder() {
      if (createCustomClassRequestBuilder_ == null) {
        if (!(requestCase_ == 13)) {
          request_ = com.google.cloud.speech.v2.CreateCustomClassRequest.getDefaultInstance();
        }
        createCustomClassRequestBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.speech.v2.CreateCustomClassRequest,
                com.google.cloud.speech.v2.CreateCustomClassRequest.Builder,
                com.google.cloud.speech.v2.CreateCustomClassRequestOrBuilder>(
                (com.google.cloud.speech.v2.CreateCustomClassRequest) request_,
                getParentForChildren(),
                isClean());
        request_ = null;
      }
      requestCase_ = 13;
      onChanged();
      return createCustomClassRequestBuilder_;
    }
<pre>
The CreateCustomClassRequest that spawned the Operation.
</pre>

<code>.google.cloud.speech.v2.CreateCustomClassRequest create_custom_class_request = 13;
</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/OperationMetadata.java