AdmiralCloud ElasticSearch Connector

This helper initialitzes ElastistSearch instances and makes them available on a global variable

Usage

```
const esOptions = {
servers: [
{ server: 'cluster', host: 'localhost', port: 9243, auth: 'username:password', apiVersion: '7.1', protocol: 'https' }
],
indices: [
{ model: 'books', type: 'item', indexInfix: 'books', server: 'cluster', resetForTest: true, instance: 'books' }
]
}

TBC