This endpoint triggers a job that syncs the available schemas from the data source to Alation. The syncing process may take some time. This endpoint returns a job ID that you can use with the Jobs API to check the status of the sync. When the job finishes, then you can use the available_schemas endpoint to fetch the list of schemas.
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curl --request POST \
--url https://alation_domain/integration/v2/datasource/datasource_id/refresh_available_schemas/ \
--header 'accept: application/json'