private void maybeForceBuilderInitialization() {
        if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
          getGcsSourceFieldBuilder();
        }
      }
<pre>
The Cloud Storage input instances.
</pre>

Protobuf type {@code google.cloud.vertexai.v1.Examples.ExampleGcsSource}
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Examples.java