Use Elasticsearch's Scroll API

Description

Elasticsearch results can be paged through in 2 ways. The first and simpler way is to use from and to parameters. The second way is the Scroll API. From an to are limited to a fixed amount of maximum result. Which is set by our database image to 30.000. If the number of items extends this number. Paging isn't possible...

We should use the newer API to solve this...

cc: @krlwlfrt