use latest version (2.3.2) of direct-index API
updated dependency for direct indexing to exclude changes per RUCK/UKRI
adjusted dependencies
including solr75 dependencies
depending on dnet-index-client:2.3.3 (using static methods to access trivial utilities)
adjusted dependencied to avoid conflicts with solr75 specific modules
integrated changes from beta branch: removed dnet-datasource-rest-api, added dnet-directindex-api
fixed pom
branch for the production system
excluding dnet-datasource-rest-api until we provide a release
updated parent
updated deps
codebase used to migrate to java8 the production system