Upgrade to ES 5.0
- Upgrade to Java 8 required
- Only minor changes in code for compilation errors
- log4j 2 requires binding to slf4j
- new string mappings ->task 610
(from redmine: issue id 608, created on 2018-01-22tgradl, closed on 2018-01-24)
(from redmine: issue id 608, created on 2018-01-22tgradl, closed on 2018-01-24)