Advantages of using redis

Elastic Stack Logstash
1

Look at some documentation when building the ELK.
Sometimes install Redis in front of Logstash.

Even though Logstash provides a buffer, is there any advantage to installing Logstash in front?

If Redis is present but not, but Elasticsearch does not receive logs, the logs are left in a queue or buffer.

2

You can manually enable persistent queues in logstash if you want logstash to hang on to messages before they are processed or if you think that there could be a communication problem with the output of logstash.
Read this article for reference:

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