L3 - Default Description
AT:
- Move all es.analyzer.* from configuration to the ElasticsearchConstants class
- the default config file service-config.yaml also doesn't contain those entries anymore
- the default config file in the documentation should be adjusted as well
Context:
In the past we used to define all constants in the ConfigurationService. However we shouldn't allow the user to change those values. Therefore, let's hard code all all es.analyzer.* settings.