Update role per java changes on upstream

[neonmei]

Hi team!
With upcoming roles release detailed in PR #499, the elastic stack version is bumped to 7.9.3 and there were some changes regarding java version and upstream-distributed jvm.options in the versions in between.

• https://www.elastic.co/guide/en/elasticsearch/reference/current/release-notes-7.9.2.html
• https://www.elastic.co/guide/en/elasticsearch/reference/current/release-notes-7.9.3.html

We should reflect those changes on our role, specially because elasticsearch service startup might fail because of this:

-XX:+UseConcMarkSweepGC
-XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly

[Zenidd]

The new jvm.options template looks good and it's really nice that it has different configurations based on java version. The tests are OK so, LGTM!