public Builder setManualMode(
          com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig.ManualRoutingMode value) {
        if (manualModeBuilder_ == null) {
          if (value == null) {
            throw new NullPointerException();
          }
          routingConfig_ = value;
          onChanged();
        } else {
          manualModeBuilder_.setMessage(value);
        }
        routingConfigCase_ = 2;
        return this;
      }
<pre>
Manual routing.
</pre>

<code>
.google.cloud.vertexai.v1.GenerationConfig.RoutingConfig.ManualRoutingMode manual_mode = 2;
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerationConfig.java