Abc import from local MS SqlServer to local ElasticSearch

I am trying to use ABC to import data from my local sql server instance to my local elasticsearch instance (running on a docker container)

When I run the following command to import data from sql server to my elasticsearch

abc import --src_type=mssql --src_uri="sqlserver://User:P@ss@DBINSTANCE\DEV:1433?database=DBNAME" http://localhost:9200

I get the following error:

Panic at 48: connection error, http://localhost:9200 [recovered]

Nonetheless, curl to http://localhost:9200 is returning with no problems (200-OK)

Any help would be appreciate. Thanks!