bulk. BulkUpdate. CollectErrors did not print the error log

[liuyinyin]

When using Docstore. IndexAll (Class), IO. Ebeanservice. Elastic. Bulk. BulkUpdate. CollectErrors did not print the error log, want to add a listener, when there is an error to see what had happened.
I changed the code in my project, added listeners, and saw exactly what went wrong.

[rbygrave]

Right.

Do you want to submit a PR showing the API changes you'd like with the listeners?

Additionally or alternatively it looks like BulkUpdate.flush() should return the collected errors ... which would be a List<Map<String,Object>> but we should probably wrap that in a new BulkResponse type object.

[liuyinyin]

I'm going to submit a PR recently.