@Override
    public String formatRemoteTopic(String sourceClusterAlias, String topic) {
        return sourceClusterAlias + separator + topic;
    }
Default implementation of {@link ReplicationPolicy} which prepends the source cluster alias to
remote topic names.
For example, if the source cluster alias is "us-west", topics created in the target cluster will be named
us-west.&lt;TOPIC&gt;. The separator is customizable by setting {@link #SEPARATOR_CONFIG} and defaults to a period.
connect/mirror-client/src/main/java/org/apache/kafka/connect/mirror/DefaultReplicationPolicy.java