private void maybeForceBuilderInitialization() {
      if (com.google.protobuf.GeneratedMessageV3.alwaysUseFieldBuilders) {
        getSystemInstructionFieldBuilder();
        getContentsFieldBuilder();
        getToolsFieldBuilder();
        getToolConfigFieldBuilder();
        getCreateTimeFieldBuilder();
        getUpdateTimeFieldBuilder();
        getUsageMetadataFieldBuilder();
      }
    }
<pre>
A resource used in LLM queries for users to explicitly specify what to cache
and how to cache.
</pre>

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