Using the --dev flag is the only support way to change the internal
Kibana environment to something else. Allowing NODE_ENV to be set at all
can have unexpected results with our dependencies, so we now always set
it to production.
V8 will not trigger a full mark-sweep & mark-compact until there is memory pressure for the max-old-space-size, which is 1.6GB on a 64bit system. This means that Kibana will, at times, consume over 1.6GB of RSS memory.
Bypassing this can be done by starting with `--dev` or explicitally setting `max-old-space-size`. For example: `NODE_OPTIONS="--max-old-space-size=1024" ./bin/kibana`
Signed-off-by: Tyler Smalley <tyler.smalley@elastic.co>
