private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.speech.v2.UndeleteRecognizerRequest,
            com.google.cloud.speech.v2.UndeleteRecognizerRequest.Builder,
            com.google.cloud.speech.v2.UndeleteRecognizerRequestOrBuilder>
        getUndeleteRecognizerRequestFieldBuilder() {
      if (undeleteRecognizerRequestBuilder_ == null) {
        if (!(requestCase_ == 12)) {
          request_ = com.google.cloud.speech.v2.UndeleteRecognizerRequest.getDefaultInstance();
        }
        undeleteRecognizerRequestBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.speech.v2.UndeleteRecognizerRequest,
                com.google.cloud.speech.v2.UndeleteRecognizerRequest.Builder,
                com.google.cloud.speech.v2.UndeleteRecognizerRequestOrBuilder>(
                (com.google.cloud.speech.v2.UndeleteRecognizerRequest) request_,
                getParentForChildren(),
                isClean());
        request_ = null;
      }
      requestCase_ = 12;
      onChanged();
      return undeleteRecognizerRequestBuilder_;
    }
<pre>
The UndeleteRecognizerRequest that spawned the Operation.
</pre>

<code>.google.cloud.speech.v2.UndeleteRecognizerRequest undelete_recognizer_request = 12;
</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/OperationMetadata.java