This member is added by an implicit conversion from ShardInitialized to
any2stringadd[ShardInitialized] performed by method any2stringadd in scala.Predef.
This member is added by an implicit conversion from ShardInitialized to
StringFormat[ShardInitialized] performed by method StringFormat in scala.Predef.
We must be sure that a shard is initialized before to start send messages to it. Shard could be terminated during initialization.