I have a three node ELK cluster with 500M documents in 900 indices. The cluster has been running without any memory-related issues for over a year.
I recently started using heartbeat and the Uptime app.
Version is 6.8.0.
I suddenly started getting OutOfMemory-exceptions that crashed one of the elasticsearch nodes. After some investigations, it is clear that this happens when you click on a link in the Error list table. See screenshot. I get a crash everytime I hit the top row in the table.
I have heartbeat data for only 15 days. 2880 heartbeats per day in daily indices. 1 primary and one replica per index.