title: When to use Mono<List<Object>> and when Flux<Object> for RestController method
body: <p>I'm using Spring web-flux with Reactor and for me is not clear when RestController method should return </p>
  
  <p><code>Mono &lt;List&lt;Object&gt;&gt;</code> and when  <code>Flux&lt;Object&gt;</code>.</p>
  
  <p>Could you provide some case when to use each of them?</p>