Generates a TaskExecutor to control the threads used in a given @async

PayloadGeneratorConfiguration.java

@Bean(name = "myThreadPoolTaskExecutor")
public TaskExecutor threadPoolTaskExecutor() {
    ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
    executor.setCorePoolSize(4);
    executor.setMaxPoolSize(4);
    executor.setThreadNamePrefix("executor");
    executor.initialize();
    return executor;
}