Hi Jean-François,
if the NCast devices are actually using the /api/ endpoints for this,
that should be fine, but given how old their integration is, it could
also be that they were still using the internal API of the series
service. Maybe you can take a look at a tcpdump or the Nginx logs to be
sure.
If the latter, the fulltext search capability of the series service
itself has been removed along with the series service in Opencast 12:
https://docs.opencast.org/r/12.x/admin/#releasenotes/#api-changes
Maybe that's causing the problem?
Best regards,
Lars