Use cases for Weblogic with ELK stack

Elastic Stack Logstash
1

I'm evaluating ELK stack to implement log centralization so that developers do not need to log on to unix boxes. All logs should be available on a single GUI tagged with host, JVM name.

We already have weblogic JVM monitoring via HP Diagnostics so I don't see much use of filtering my logs via logstash and its filters.
Are there any other use cases of logstash with weblogic which are not covered by existing monitoring tools ? I want to understand if it is really worth the effort to go for filebeat --> logstash --> elassticsearch --> kibana ?

If I want to implement above use case, I can simply do it via filebeat --> elasticsearch --> kibana.

2

Unless Weblogic is capable of producing JSON logs with discrete fields for the various kinds of information available in an application log message (including a timestamp that Elasticsearch can parse out of the box), that kind of canonicalization and parsing of the raw events is a major reason to use Logstash.