public KafkaSink(String zookeeperAddress, String topicId, Properties producerConfig,
SerializationSchema serializationSchema)
{% endhighlight %}
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If this constructor is used, the user needs to make sure to set the broker with the "metadata.broker.list" property. Also the serializer configuration should be left default, the serialization should be set via SerializationSchema.
More about Kafka can be found [here](https://kafka.apache.org/documentation.html).