Datahub harvesting pipeline: mapping of metadata fields

The initial code to harvest aggregated metadata of ESS datasets from the search index of the Datahub is already implemented, see https://git.rwth-aachen.de/nfdi4earth/knowledgehub/kh-populator/-/blob/dev/kh_populator_domain/datahub.py?ref_type=heads#L8 (and the related searcher in kh_populator/harvesting searchers and consumer in kh_populator/harvesting_consumers).

The metadata is retrieved as JSON documents as returned from the underlying ElasticSearch index from the endpoint https://o2a-data.de/index/rest/search.

However, in the function datahub_record_to_n4e we currently only map/translate a few basic fields and more fields must be included.

• title
• description
• download/Distribution->accessUrl
• spatialCoverage
• temporalCoverage
• keywords
• link to entry of re3data repository in the KH
• license
• authors
• publishing organization
• ...