@java.lang.Override
    public com.google.cloud.visionai.v1.AnnotationValue getElementsOrThrow(java.lang.String key) {
      if (key == null) {
        throw new NullPointerException("map key");
      }
      java.util.Map<java.lang.String, com.google.cloud.visionai.v1.AnnotationValueOrBuilder> map =
          internalGetMutableElements().ensureBuilderMap();
      if (!map.containsKey(key)) {
        throw new java.lang.IllegalArgumentException();
      }
      return elementsConverter.build(map.get(key));
    }
<pre>
A map from elements' keys to element's annotation value.
</pre>

<code>map&lt;string, .google.cloud.visionai.v1.AnnotationValue&gt; elements = 2;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/AnnotationCustomizedStruct.java