Rework GS crawl concept
- how to relate with index and schema?
- Determine, when reindexing needs to be done and which crawl data to reevaluate
(from redmine: issue id 506, created on 2018-01-22tgradl, closed on 2018-01-24)
(from redmine: issue id 506, created on 2018-01-22tgradl, closed on 2018-01-24)