public Builder mergeRoutingConfig(
        com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig value) {
      if (routingConfigBuilder_ == null) {
        if (((bitField0_ & 0x00002000) != 0)
            && routingConfig_ != null
            && routingConfig_
                != com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig
                    .getDefaultInstance()) {
          getRoutingConfigBuilder().mergeFrom(value);
        } else {
          routingConfig_ = value;
        }
      } else {
        routingConfigBuilder_.mergeFrom(value);
      }
      if (routingConfig_ != null) {
        bitField0_ |= 0x00002000;
        onChanged();
      }
      return this;
    }
<pre>
Optional. Routing configuration.
</pre>

<code>
optional .google.cloud.vertexai.v1.GenerationConfig.RoutingConfig routing_config = 17 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerationConfig.java