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Tests with heap size set to 4 GB which indeed isn't more than 50% of the 8 GB the total memory, generated some out of memory exceptions, so it's better to think in terms of “less than” "less than" rather than “no "no more than”than".

On a running elasticsearch instance:

If the command " systemctl -l status elasticsearch.service " produces 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 and , that is set the option " -Des.transport.cname_in_publish_address=true".