public java.lang.String getResultAnnotationKeys(int index) {
    return resultAnnotationKeys_.get(index);
  }
<pre>
A list of annotation keys to specify the annotations to be retrieved and
returned with each search result.
Annotation granularity must be GRANULARITY_ASSET_LEVEL and its search
strategy must not be NO_SEARCH.
</pre>

<code>repeated string result_annotation_keys = 8;</code>

@param index The index of the element to return.
@return The resultAnnotationKeys at the given index.
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/SearchAssetsRequest.java