CDS-only search not possible

What causes this issue?

Because of the HANA-release, Enterprise Search cannot be run with
CDS-based search connectors only.
In this situation, at least the connectors for the Enterprise
Search-models ESH_CONNECTOR and ESH_CATEGORY (of ES-software component
ESH_COMMON_OBJECTS) are required.

System Response

If the mandatory traditional connectors are there, Enterprise Search is
fully operational, and for CDS-based connectors, too.

How to fix this error?

No action required.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.