public NewTopicBuilder defaultReplicationFactor() {
            this.replicationFactor = NO_REPLICATION_FACTOR;
            return this;
        }
Specify the replication factor for the topic should be the broker configurations for
{@code default.replication.factor}.

@return this builder to allow methods to be chained; never null
connect/runtime/src/main/java/org/apache/kafka/connect/util/TopicAdmin.java