When Spark connects to a server using TLS, it will validate the certificate chain that's presented by the server.
One of the validation checks that are performed makes sure that the certificate has not been revoked by the original issuer. One of the mechanisms that can be used for this is OCSP.
When servers present a certificate chain that is 'complete' (a chain that includes all certificates, including the leaf/end-entity and root CA certificate), then OCSP validation in Spark fails with this error: "Certificate does not specify OCSP responder"
The cause for this is that the entire chain is being validated, including the root CA certificate / trust anchor. Root certificates do not contain CRL and OSCP links, and should be excluded. See https://stackoverflow.com/a/38128883