Add prometheus-es-exporter

Example config in cluster model:

```
properties:
  prometheus:
    elasticsearch_exporter:
      queries:
        all:
          enabled: False
        terms:
          indices: '<notification-{now/d}>'
          json: |
            {
                "size": 0,
                "query": {
                    "match_all": {}
                },
                "aggs": {
                    "program": {
                        "terms": {
                            "field": "programname.keyword"
                        }
                    }
                }
            }
```

Change-Id: I86553b392f7af669913052430ba6778b1c537154
Related-bug: PROD-27904 (PROD:27904)
5 files changed