ODBC Connection String for ElasticSearch

Hi everyone

I'm struggling to establish a connection to my ElasticSearch data source on Power BI Online.

On the desktop I've successfully connected to the source via the ODBC connector, as I've previously set up the ODBC on my computer.

I've then installed a personal gateway and published my report to PowerBI Online. However, when setting up the connections on the datasource, I've come to this:

I've tried the regular credentials but the main issue is that the connection string doesn't seem to be found. I've looked on the ODBC data source admin to see if there's any connection string, but there isn't. Also I didn't pass any to PowerBI desktop, only the configured dsn