@java.lang.Override
      public int hashCode() {
        if (memoizedHashCode != 0) {
          return memoizedHashCode;
        }
        int hash = 41;
        hash = (19 * hash) + getDescriptor().hashCode();
        if (hasModelName()) {
          hash = (37 * hash) + MODEL_NAME_FIELD_NUMBER;
          hash = (53 * hash) + getModelName().hashCode();
        }
        hash = (29 * hash) + getUnknownFields().hashCode();
        memoizedHashCode = hash;
        return hash;
      }
<pre>
Optional. The model name used for ranking.
Format: `gemini-1.5-pro`
</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