When I choose a data source and click preview, I get one of two errors, depending on the source. If I use TimeLion and I get a
[timelion] > Request failed with status code 502. If I go with Elasticsearch raw documents, I get
[esdocs] > Unexpected error from Elasticsearch: [unsupported_operation_exception] null
Is there some kind of setup that's required, is Canvas a paid license feature only?