extract attribute and entity meta data repo interfaces
add elasticsearch repo decorators for attribute and entity meta data
use elasticsearch meta data repo decorators for mysql repo
Add copy constructors for default entity and attribute meta data
Fix NPE in case elasticsearch service is null
Fix test
Merge branch 'master' of https://github.com/molgenis/molgenis into feature/indexingrepo
merge with molgenis master
Merge pull request #1814 from dennishendriksen/feature/indexingrepo

Elasticsearch repo decorators for attribute and entity meta data