@java.lang.Override
      public Builder clear() {
        super.clear();
        bitField0_ = 0;
        if (rankServiceBuilder_ != null) {
          rankServiceBuilder_.clear();
        }
        if (llmRankerBuilder_ != null) {
          llmRankerBuilder_.clear();
        }
        rankingConfigCase_ = 0;
        rankingConfig_ = null;
        return this;
      }
<pre>
Config for ranking and reranking.
</pre>

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