Merge branch 'develop' of https://github.com/Deutsche-Digitale-Bibliothek/ddb-next into develop
some refactoring
cosmetics
compare a locally stored mapping with that from a given Elastic Search server
adapted schema to be compatible to the production server
retrieve mappings from Elastic Search
delete mappings from Elastic Search server
cosmetics
Merge branch 'DDBNEXT-957' into develop