public com.google.cloud.vision.v1p4beta1.WebDetection.WebLabel.Builder
        addBestGuessLabelsBuilder(int index) {
      return getBestGuessLabelsFieldBuilder()
          .addBuilder(
              index, com.google.cloud.vision.v1p4beta1.WebDetection.WebLabel.getDefaultInstance());
    }
<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.v1p4beta1.WebDetection.WebLabel best_guess_labels = 8;
</code>
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/WebDetection.java