Issue dates are not always preserved #230
Description
Sometimes we have an issue date like 2015, which is a valid ISO 8601 date, yet I noticed that when I export results from OpenRXV the date appears as 2015-01-01. There is no way to know whether the item was actually issued on that date, or if the date was converted.
In DSpace, issue dates are always formatted as YYYY, or YYYY-MM, or YYYY-MM-DD. It may be possible to adjust the date format in the Elasticsearch field.