Use Delete By Query API for delete by query operations [DATAES-570]

[spring-projects-issues]

Sascha Woo opened DATAES-570 and commented

Elasticsearch re-introduces the Delete By Query API [1] in Version 5.x so it's time to move over. At the moment our ElasticsearchTemplate use Scroll and Delete API to perform a delete by query.

https://www.elastic.co/guide/en/elasticsearch/reference/5.0/docs-delete-by-query.html

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Referenced from: pull request #280