How to make resolvers run async - graphql

Question

I am setting up java based graphQl App and find graphql-java-tools really convenient the problem though while itis pretty straight forward
With graphql-java to make field resolvers Async I couldn't Find a way to do it using graphql-java-tools
I tried
#Bean
public ExecutionStrategy executionStrategy() {
return new AsyncExecutionStrategy();
}
Here resolvers I use in order to test
#Component
public class VideoResolver implements GraphQLResolver<Video> {
public Episode getEpisode(Video video){
Episode result = new Episode();
result.setTitle("episodeTitle");
result.setUuid("EpisodeUuid");
result.setBrand("episodeBrand");
try {
Thread.sleep(2000L);
System.out.println(Thread.currentThread().getName());
} catch (InterruptedException e) {
e.printStackTrace();
}
return result;
}
public List<Images> getImages(Video video){
Images image = new Images();
image.setFileName("Image FileName1");
List<Images> imageList = new ArrayList<>();
imageList.add(image);
try {
Thread.sleep(2000L);
System.out.println(Thread.currentThread().getName());
} catch (InterruptedException e) {
System.out.println("Exxxxxxxxxx");
}
return imageList;
}
}
Was assuming this should run in about 2 seconds and print two different streams but no it takes 4
and print it is all in one same stream