private void ensureNormalizedVerticesIsMutable() {
      if (!((bitField0_ & 0x00000002) != 0)) {
        normalizedVertices_ =
            new java.util.ArrayList<com.google.cloud.vision.v1p4beta1.NormalizedVertex>(
                normalizedVertices_);
        bitField0_ |= 0x00000002;
      }
    }
<pre>
The bounding polygon vertices.
</pre>

<code>repeated .google.cloud.vision.v1p4beta1.Vertex vertices = 1;</code>
java-vision/proto-google-cloud-vision-v1p4beta1/src/main/java/com/google/cloud/vision/v1p4beta1/BoundingPoly.java