public Builder addBestGuessLabels(com.google.cloud.vision.v1.WebDetection.WebLabel value) {
      if (bestGuessLabelsBuilder_ == null) {
        if (value == null) {
          throw new NullPointerException();
        }
        ensureBestGuessLabelsIsMutable();
        bestGuessLabels_.add(value);
        onChanged();
      } else {
        bestGuessLabelsBuilder_.addMessage(value);
      }
      return this;
    }
<pre>
The service's best guess as to the topic of the request image.
Inferred from similar images on the open web.
</pre>

<code>repeated .google.cloud.vision.v1.WebDetection.WebLabel best_guess_labels = 8;</code>
java-vision/proto-google-cloud-vision-v1/src/main/java/com/google/cloud/vision/v1/WebDetection.java