Implement ElasticSearch's Scroll api to scroll/fetch large amounts of data

[Sigve-Fast]

By default regular pagination is limited to not get elements past no. 10 000 in the result. This is an issue if one would like to fetch larger amounts of elements from the index.

ElasticSearch's answer to this is the Scroll api. https://www.elastic.co/guide/en/elasticsearch/reference/6.4/search-request-scroll.html