Ask HN: Visualize / categorize exception logs

Problem: my java service produces 30k exceptions / hour in error logs. These logs are piped to Elasticsearch / Kibana but it is still difficult to analyze and summarize all the different exception types and causes.

Are there any products for categorizing exceptions? I'm envisioning a product I could stream logs to and it would analyze the stack traces from the log, root exception class, error messages, etc. And produce a high level summary or visualization.

I'm searching for an open source solution that can be self-hosted.