Notable changes:
- index rollover now run on a polling loop rather than just at startup
- using graceful for controlled http shutdown
- index name now configurable via ES_ALIAS
- create active write alias as ES_ALIAS
- create index with name ES_ALIAS and a numbered suffix eg prom-metrics-1
- create index template with passed settings (shards/replicas/mappings/etc)
- no need for search alias as now uses wildcard search ie <ES_ALIAS>-*
Breaking changes:
- configuration parameters
- listening address is now :8000