Spaces enable you to organize your dashboards and other saved objects into meaningful categories. You can use the default space or create your own spaces.
To run APIs in non-default spaces, you must add s/{space_id}/ to the path.
For example:
curl -X GET "http://localhost:5601/s/marketing/api/data_views"
If you use the Kibana console to send API requests, it automatically adds the appropriate space identifier.
To learn more, check out Spaces.