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Here is some information from the Administration guide to get you started and a link to the information:
1. If you want to use the Java-based modules of syslog-ng PE (for example, the Elasticsearch, HDFS, or Kafka destinations), download and install the Java Runtime Environment (JRE), 1.7 (or newer).
2. Download the latest stable binary release of the Apache Kafka libraries (version 0.9 or newer) from http://kafka.apache.org/downloads.html.
3. Extract the Apache Kafka libraries into a single directory. If needed, collect the various .jar files into a single directory (for example, /opt/kafka/lib/) where syslog-ng PE can access them. You must specify this directory in the syslog-ng PE configuration file.
4. Check if the following files in the Kafka libraries have the same version number: slf4j-api-
Here is the direct link to the section in the Administration Guide: kafka: Publishing messages to Apache Kafka