I am running a 3 Master 8 Data node cluster.
Elasticsearch Version 7.8.0
The cluster bumps along happily for several days with the regular sawtooth JVM pattern then suddenly ramps up and then hits 99%.
This leads to issues performing normal operations. A restart puts the memory back to normal levels but I can't figure out what causes it. I have seen before that a memory leak in a previous version caused similar issues but I would have thought that the GC would keep the JVM usage within comfortable limits.