@java.lang.Override
      public final boolean isInitialized() {
        byte isInitialized = memoizedIsInitialized;
        if (isInitialized == 1) return true;
        if (isInitialized == 0) return false;

        memoizedIsInitialized = 1;
        return true;
      }
<pre>
Optional. The model name of the rank service.
Format: `semantic-ranker-512&#64;latest`
</pre>

<code>optional string model_name = 1 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for modelName.
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/RagRetrievalConfig.java