title: RabbitMQ Topic format - sub-topic under main topic
body: <p>When I am trying to push to topic in this format <strong>/topic/pushing/{organizationId}</strong> I am getting an error </p>
  
  <pre><code>messagingTemplate.convertAndSend("/topic/pushing/" + obj.getCustomerid(), obj);
  </code></pre>
  
  <p>The error: </p>
  
  <blockquote>
    <p>15:06:48.901 [reactor-tcp-io-1] ERROR
    o.s.m.s.s.StompBrokerRelayMessageHandler - Received ERROR
    {message=[Invalid destination], content-type=[text/plain],
    version=[1.0,1.1,1.2], content-length=[53]} session=<em>system</em>
    text/plain <strong>payload='/pushing/2963_ent' is not a valid topic
    destination</strong></p>
  </blockquote>
  
  <p>However when I change it to this format <strong>/topic/pushing.{organizationId}</strong>, replacing the slash with dot, it's working fine: </p>
  
  <pre><code>messagingTemplate.convertAndSend("/topic/pushing." + obj.getCustomerid(), obj);
  </code></pre>
  
  <p>Any idea how I can keep the slash / and have sub-topics under the main topic. </p>