private com.google.protobuf.SingleFieldBuilderV3<
              com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig.AutoRoutingMode,
              com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig.AutoRoutingMode.Builder,
              com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig.AutoRoutingModeOrBuilder>
          getAutoModeFieldBuilder() {
        if (autoModeBuilder_ == null) {
          if (!(routingConfigCase_ == 1)) {
            routingConfig_ =
                com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig.AutoRoutingMode
                    .getDefaultInstance();
          }
          autoModeBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig.AutoRoutingMode,
                  com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig.AutoRoutingMode
                      .Builder,
                  com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig
                      .AutoRoutingModeOrBuilder>(
                  (com.google.cloud.vertexai.api.GenerationConfig.RoutingConfig.AutoRoutingMode)
                      routingConfig_,
                  getParentForChildren(),
                  isClean());
          routingConfig_ = null;
        }
        routingConfigCase_ = 1;
        onChanged();
        return autoModeBuilder_;
      }
<pre>
Automated routing.
</pre>

<code>
.google.cloud.vertexai.v1.GenerationConfig.RoutingConfig.AutoRoutingMode auto_mode = 1;
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/GenerationConfig.java