public Builder setVoiceCloningKey(java.lang.String value) {
      if (value == null) {
        throw new NullPointerException();
      }
      voiceCloningKey_ = value;
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<pre>
Required. Created by GenerateVoiceCloningKey.
</pre>

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

@param value The voiceCloningKey to set.
@return This builder for chaining.
java-texttospeech/proto-google-cloud-texttospeech-v1/src/main/java/com/google/cloud/texttospeech/v1/VoiceCloneParams.java