public Builder clearCreatePhraseSetRequest() {
      if (createPhraseSetRequestBuilder_ == null) {
        if (requestCase_ == 17) {
          requestCase_ = 0;
          request_ = null;
          onChanged();
        }
      } else {
        if (requestCase_ == 17) {
          requestCase_ = 0;
          request_ = null;
        }
        createPhraseSetRequestBuilder_.clear();
      }
      return this;
    }
<pre>
The CreatePhraseSetRequest that spawned the Operation.
</pre>

<code>.google.cloud.speech.v2.CreatePhraseSetRequest create_phrase_set_request = 17;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/OperationMetadata.java