private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.speech.v2.UpdateConfigRequest,
            com.google.cloud.speech.v2.UpdateConfigRequest.Builder,
            com.google.cloud.speech.v2.UpdateConfigRequestOrBuilder>
        getUpdateConfigRequestFieldBuilder() {
      if (updateConfigRequestBuilder_ == null) {
        if (!(requestCase_ == 21)) {
          request_ = com.google.cloud.speech.v2.UpdateConfigRequest.getDefaultInstance();
        }
        updateConfigRequestBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.speech.v2.UpdateConfigRequest,
                com.google.cloud.speech.v2.UpdateConfigRequest.Builder,
                com.google.cloud.speech.v2.UpdateConfigRequestOrBuilder>(
                (com.google.cloud.speech.v2.UpdateConfigRequest) request_,
                getParentForChildren(),
                isClean());
        request_ = null;
      }
      requestCase_ = 21;
      onChanged();
      return updateConfigRequestBuilder_;
    }
<pre>
The UpdateConfigRequest that spawned the Operation.
</pre>

<code>
.google.cloud.speech.v2.UpdateConfigRequest update_config_request = 21 [deprecated = true];
</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/OperationMetadata.java