Logstash Kafka output: adds extra topics


I have a config file with Kafka output like this:

topic_id => "%{product}-%{event_type}"

It work fine and index the log to the corresponding topic, but additionaly it creates a new topic called "%{product}" with all the logs of that product, regardless the "%{event_type}".

For example:
I have this log:
And it goes this topics: foo-bar and foo

So my question is, how to avoid that the log goes to the topic foo?

Logstash version: 5.2.1

Joaquín Silva

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