Hi,
as the note you mentioned describes, will the upgrade script fail, if a distributed EC Component was detected in the deployment. The script ends with a hint, first to migrate the EC component from glusterfs to drbd.
I can confirm that from one of my migrations from 7.3.2FPx to 7.4.2FP3 a few month ago. I would expect the same procedure in your scenario.
I have no experience of what happens when 7.4.2 is skipped..
To be on the safe side, I would create a support ticket to check this.
Regards,
Ralph
#QRadar#Support#SupportMigration