Add additionalResolvers example for passing args to nested fields

I am trying to use it to wrap a remote schema in a container running https://github.com/graphql-compose/graphql-compose-elasticsearch (graphql queries to elasticsearch).

For my case I need to restrict the indices that a client can query. I'm stuck on how to use additionalResolvers to pass args to a nested field.

Here's a query example against target: https://imgur.com/a/tDVT8bC and my attempt so far: https://gist.github.com/rboyd/f67d5efc03221bb936926fdc0d33201f (line 6 where I try elastic.api.elastic.search) I'm not sure where to find docs or impl of what the api function expects for args.

Start with the additionalResolvers usage in the linked gist, especially line 6, and compare it with the remote-schema and nested-field behavior shown in the issue. Document an additionalResolvers example that passes arguments to the nested field and demonstrates restricting the Elasticsearch indices; the example should make the expected API arguments clear.

Written by the indexing model from the issue text.