Elastic Internal TCs with relay connection

Hi @nodkz , Do you have a way to support relay/connection for internal or nested data?

So lets say you have a root defined by:

```js
const FlightEsTC = composeWithElastic({
graphqlTypeName: 'fl',
elasticIndex: 'kibana_sample_data_flights',
elasticType: '_doc',
elasticMapping: ecommerceMapping,
elasticClient: elasticClient,
schemaComposer: schemaComposer
});
```

And You wanna add relays to internal sub query:
```js
let EcommerceecommerceGeoipTC = schemaComposer.getOTC('ecommerceecommerceGeoip');

schemaComposer.getOTC('ecommerceecommerce').addFields({
geoipConnection: composeWithRelay(EcommerceecommerceGeoipTC)
```
How can we do this?