private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vision.v1.OutputConfig,
            com.google.cloud.vision.v1.OutputConfig.Builder,
            com.google.cloud.vision.v1.OutputConfigOrBuilder>
        getOutputConfigFieldBuilder() {
      if (outputConfigBuilder_ == null) {
        outputConfigBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vision.v1.OutputConfig,
                com.google.cloud.vision.v1.OutputConfig.Builder,
                com.google.cloud.vision.v1.OutputConfigOrBuilder>(
                getOutputConfig(), getParentForChildren(), isClean());
        outputConfig_ = null;
      }
      return outputConfigBuilder_;
    }
<pre>
Required. The desired output location and metadata (e.g. format).
</pre>

<code>.google.cloud.vision.v1.OutputConfig output_config = 4;</code>
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/AsyncAnnotateFileRequest.java