Data Import Handler problem in Solr 8

[Michał Świątkowski]

Hello All,

I'm using Solr-8.11.1 in cloud mode with OpenJDK8. From Solr-8 I noticed 
that full-update with option 'optimize' (e.g. 
/dataimport?command=full-import&clean=true&commit=true&wt=json&*optimize=true*) 
removes all collection data and during the update collection is empty. 
Does anyone know is this is a bug or new feature?

Thanks,
Michal