[Apicurio] Java/REST API: Documentation of fields - globalId/contentId

Hello, we are starting evaluation of the apicurio registry. We will be using avro-schema and want to serialize to avro single-object-encoded (byteArray that contains a long-fingerprint to identify the schema). This means that we will need a reliable way to query by the fingerprintId. Can I use the globalId for this? When I upload the schema file via web-ui, the globalId is just based on a sequence, but it seems I would be able to update the metaData of this schema, so I could replace the globalId with an avro fingerprint. Is globalId the correct field? What is the difference to the contentId? Why are properties stored as key/value map, but queried as List<String>? Thanks Jan