private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.vertexai.api.DynamicRetrievalConfig,
            com.google.cloud.vertexai.api.DynamicRetrievalConfig.Builder,
            com.google.cloud.vertexai.api.DynamicRetrievalConfigOrBuilder>
        getDynamicRetrievalConfigFieldBuilder() {
      if (dynamicRetrievalConfigBuilder_ == null) {
        dynamicRetrievalConfigBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.vertexai.api.DynamicRetrievalConfig,
                com.google.cloud.vertexai.api.DynamicRetrievalConfig.Builder,
                com.google.cloud.vertexai.api.DynamicRetrievalConfigOrBuilder>(
                getDynamicRetrievalConfig(), getParentForChildren(), isClean());
        dynamicRetrievalConfig_ = null;
      }
      return dynamicRetrievalConfigBuilder_;
    }
<pre>
Specifies the dynamic retrieval configuration for the given source.
</pre>

<code>.google.cloud.vertexai.v1.DynamicRetrievalConfig dynamic_retrieval_config = 2;</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GoogleSearchRetrieval.java