title: Initialize an entity on startup on Akka Sharding
body: <p>How could I prestart an entity at cluster startup? I have found a way to do so but I think it is not the right way to do. It consists of sending a StartEntity(entityId) message to the shard region on every node. Suppose I have 1000 entities to initialize. It seems very unperformant (explosion of messages in the cluster since every node tries to initialize the remote entity)!</p>
  
  <pre><code>    val shardRegion: ActorRef[ShardingEnvelope[Command]] =
      sharding.init(Entity(HelloServiceEntity)(createBehavior = ctx =&gt; HelloWorldService()))
  
      Seq("S0", "S1").foreach { id =&gt;
        shardRegion ! StartEntity(id)
      }
  </code></pre>
  
  <p>Is there any efficient way to achieve what I want? I could not find an official post or documentation about it. Am I doing this wrong?</p>