public Builder clearVertexRagStore() {
      if (vertexRagStoreBuilder_ == null) {
        if (sourceCase_ == 4) {
          sourceCase_ = 0;
          source_ = null;
          onChanged();
        }
      } else {
        if (sourceCase_ == 4) {
          sourceCase_ = 0;
          source_ = null;
        }
        vertexRagStoreBuilder_.clear();
      }
      return this;
    }
<pre>
Set to use data source powered by Vertex RAG store.
User data is uploaded via the VertexRagDataService.
</pre>

<code>.google.cloud.vertexai.v1.VertexRagStore vertex_rag_store = 4;</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Retrieval.java