public Builder clearVoiceCloningKey() {
      voiceCloningKey_ = getDefaultInstance().getVoiceCloningKey();
      bitField0_ = (bitField0_ & ~0x00000001);
      onChanged();
      return this;
    }
<pre>
Required. Created by GenerateVoiceCloningKey.
</pre>

<code>string voice_cloning_key = 1 [(.google.api.field_behavior) = REQUIRED];</code>

@return This builder for chaining.
java-texttospeech/proto-google-cloud-texttospeech-v1beta1/src/main/java/com/google/cloud/texttospeech/v1beta1/VoiceCloneParams.java