TODO update: so far the best value for 'datanest.organizations.batch_size' is 10000
clarified TODO: "document presentation layer" can/should be reused by ODN Search
TODO: "some simple GUI for full-text searching using SOLR" implemented by ODN Search
TODO note about "advanced search" moved to ODN Search
ETL framework, OSGI, plug-ins ... that's what ODCleanStore2 does so we will reuse that