When unindexing page recursively, we should unindex all subpages in one solr request, by executing a deleteByQuery and deleting all pages with the field "uri" starting with "path/page/*"
Or we can index all the ancestors of a page in a new solr field, and search on this field.

The resources of the pages to delete have to be also unindexed. So the resources of pages have to be indexed with an additional solr field to be easily retrieved to be deleted.