private void ensureGroundingChunkIndicesIsMutable() {
      if (!groundingChunkIndices_.isModifiable()) {
        groundingChunkIndices_ = makeMutableCopy(groundingChunkIndices_);
      }
      bitField0_ |= 0x00000002;
    }
<pre>
Segment of the content this support belongs to.
</pre>

<code>optional .google.cloud.vertexai.v1.Segment segment = 1;</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GroundingSupport.java