Function getConnection

getConnection(registry: Registry, managerName?: string): MongoClient
Retrieves the underlying MongoDB client connection from a manager in the registry.
Parameters
- registry: Registry
  The Storehouse registry containing registered managers
- OptionalmanagerName: string
  Optional name of the manager. If omitted, uses the default manager
Returns MongoClient
The MongoDB client instance
Throws
If the manager is not found in the registry

Throws
If the connection is not an instance of MongoClient
Example
```
const client = getConnection(registry, 'mongodb');
const admin = client.db().admin();
const dbs = await admin.listDatabases();
```
- Defined in src/index.ts:178