@java.lang.Override
  public int getPropertiesCount() {
    return properties_.size();
  }
<pre>
Some entities may have optional user-supplied `Property` (name/value)
fields, such a score or string that qualifies the entity.
</pre>

<code>repeated .google.cloud.vision.v1p3beta1.Property properties = 9;</code>
java-vision/proto-google-cloud-vision-v1p3beta1/src/main/java/com/google/cloud/vision/v1p3beta1/EntityAnnotation.java