There are various garbage collectors for the OpenJDK-derived JVMs
targeting different workloads. The serial collector in particular is
best suited for single logical CPU machines or extremely small heaps,
neither of which are suitable for running Elasticsearch. Using the
serial collector with Elasticsearch can be devastating for performance.
The serial collector check ensures that Elasticsearch is not configured
to run with the serial collector. To pass the serial collector check,
you must not start Elasticsearch with the serial collector (whether it’s
from the defaults for the JVM that you’re using, or you’ve explicitly
specified it with
-XX:+UseSerialGC). Note that the default JVM
configuration that ships with Elasticsearch configures Elasticsearch to
use the CMS collector.
Intro to Kibana
ELK for Logs & Metrics