Outdated documentation about logger in "Batch Processing" (v.3.3)

[WinterSilence]

$em->getConnection()->getConfiguration()->setSQLLogger(null); not actual yet.
https://www.doctrine-project.org/projects/doctrine-orm/en/3.3/reference/batch-processing.html

Also, I think you need to add links to the pagination page - loading fragments in many cases is a better solution than loading singe entities, because it works faster.