default ReplicationEndpoint postCreateReplicationEndPoint(
    ObserverContext<RegionServerCoprocessorEnvironment> ctx, ReplicationEndpoint endpoint) {
    return endpoint;
  }
This will be called after the replication endpoint is instantiated.
@param ctx      the environment to interact with the framework and region server.
@param endpoint - the base endpoint for replication
@return the endpoint to use during replication.
hbase-server/src/main/java/org/apache/hadoop/hbase/coprocessor/RegionServerObserver.java