Github user mraliagha commented on the issue:
https://github.com/apache/metron/pull/1218
Thanks, Nick. So if es.document.id is not provided, as the default, doc id
won't be send to ES indexing, right? I guess it would be also nice to provide
some guidance on how document ID should be defined (in the case of custom ID).
Otherwise, users may create some serious issues with the indexing and search
throughput. ---
