public Builder clearGenerationConfig() {
      bitField0_ = (bitField0_ & ~0x00000040);
      generationConfig_ = null;
      if (generationConfigBuilder_ != null) {
        generationConfigBuilder_.dispose();
        generationConfigBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Optional. Generation config that the model will use to generate the
response.
</pre>

<code>
optional .google.cloud.vertexai.v1.GenerationConfig generation_config = 7 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/CountTokensRequest.java