elasticsearch: Use the Elasticsearch module
elasticsearch: Use the Elasticsearch module

* Set JVM options

* Set various options

* Remaining issues:
  - How can we remove default JVM options
  - Replace hardcoded values by host-specific data

SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site