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On a running elasticsearch instance:

If the command systemctl -l status elasticsearch.service produces the following warning:

OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.

then (according to JEP 291) comment out the option -XX:+UseConcMarkSweepG and set the option -XX:+UseG1GC.

If the file /var/log/elasticsearch/wifimon_deprication.log contains warnings like the following:

transport.publish_address was printed as [ip:port] instead of [hostname/ip:port]. This format is deprecated and will change to [hostname/ip:port] in a future version. Use -Des.transport.cname_in_publish_address=true to enforce non-deprecated formatting.

then proceed with the recommendation, that is set the option -Des.transport.cname_in_publish_address=true.