Running a local Antora build resulted in the following error:

18:40:22.844] ERROR (asciidoctor): target of xref not found: transformations/convert-cloudevent-to-saveable-form.adoc
file: /home/broldan/git/debezium/documentation/modules/ROOT/pages/transformations/index.adoc 

The file that is referenced was removed in DBZ-7966 as part of the latest changes of the sink connector framework, but the entry in the index was not.