Maurizio - These settings worked for me:
For connection details -
Hostname - Milvus GRPC Host {under milvus connect details}
Port - Milvus GRPC Port {under milvus connect details}
Database - 'default' unless you specifically named it
Username - 'ibmlhapikey'
Password - {mycloud_api_key}
Select option for Port is SSL enabled
You can automate creating this connection with Ground gen AI with vectorized documents. Choose watsonx.data Milvus and follow the prompts to create the connection for you.
Good luck!