Rework indexing strategy
This is required due to changes in ES 2.0
https://www.elastic.co/guide/en/elasticsearch/plugins/2.0/plugins-delete-by-query.html
- One index per mapping might be an option
- Saving indexed data to the filesystem in order to fast reindex is another option
(from redmine: issue id 492, created on 2018-01-22tgradl, closed on 2018-01-24)
- Relations:
- relates #491
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