Kafka Logstash Topics config best practice

We are using latest Kafka and Logstash versions for ingesting several business apps log data into ELK. We have a standardized logging structure for business apps to log data into Kafka topic and able to ingest into ELK via Kafka input plugin.

Currently, we are using one kafka topic for each business app for pushing data into logstash. We have 3 logstash consumers with 3 partitions on each topic.

I am wondering about the best practice for using kafka/logstash. Is the above config as good approach or is there better approach. For example, instead of having one kafka topic for each app, should we one kafka topic across all apps? What are the pros and cons?

Would appreciate your input.

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