@java.lang.Override
  public final boolean isInitialized() {
    byte isInitialized = memoizedIsInitialized;
    if (isInitialized == 1) return true;
    if (isInitialized == 0) return false;

    memoizedIsInitialized = 1;
    return true;
  }
<pre>
Confidence score of the support references. Ranges from 0 to 1. 1 is the
most confident. This list must have the same size as the
grounding_chunk_indices.
</pre>

<code>repeated float confidence_scores = 3;</code>

@param index The index of the element to return.
@return The confidenceScores at the given index.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GroundingSupport.java