public com.google.cloud.visionai.v1.AnnotationValue.Builder putElementsBuilderIfAbsent(
        java.lang.String key) {
      java.util.Map<java.lang.String, com.google.cloud.visionai.v1.AnnotationValueOrBuilder>
          builderMap = internalGetMutableElements().ensureBuilderMap();
      com.google.cloud.visionai.v1.AnnotationValueOrBuilder entry = builderMap.get(key);
      if (entry == null) {
        entry = com.google.cloud.visionai.v1.AnnotationValue.newBuilder();
        builderMap.put(key, entry);
      }
      if (entry instanceof com.google.cloud.visionai.v1.AnnotationValue) {
        entry = ((com.google.cloud.visionai.v1.AnnotationValue) entry).toBuilder();
        builderMap.put(key, entry);
      }
      return (com.google.cloud.visionai.v1.AnnotationValue.Builder) entry;
    }
<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