private com.google.protobuf.SingleFieldBuilderV3<
            com.google.cloud.video.stitcher.v1.PrefetchConfig,
            com.google.cloud.video.stitcher.v1.PrefetchConfig.Builder,
            com.google.cloud.video.stitcher.v1.PrefetchConfigOrBuilder>
        getPrefetchConfigFieldBuilder() {
      if (prefetchConfigBuilder_ == null) {
        prefetchConfigBuilder_ =
            new com.google.protobuf.SingleFieldBuilderV3<
                com.google.cloud.video.stitcher.v1.PrefetchConfig,
                com.google.cloud.video.stitcher.v1.PrefetchConfig.Builder,
                com.google.cloud.video.stitcher.v1.PrefetchConfigOrBuilder>(
                getPrefetchConfig(), getParentForChildren(), isClean());
        prefetchConfig_ = null;
      }
      return prefetchConfigBuilder_;
    }
<pre>
The configuration for prefetching ads.
</pre>

<code>.google.cloud.video.stitcher.v1.PrefetchConfig prefetch_config = 10;</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/LiveConfig.java