Missing backward compatibility for REST API with DRILL-6562

With DRILL-6562 I am seeing additional changes which is not supporting older requests URL. For example:

1) Earlier export of plugin config was done for json format by default using URL:  /storage/{name}/export and now the new URL is /storage/{name}/export/{format}. This means the older one is not supported anymore. Is it intended or should we treat the format as JSON by default if not provided ?

2) The POST URL to create and update plugin is changed from /storage/{name} to /storage/create_update

3) Once a storage plugin is deleted it is not redirected to /storage anymore, which it was in 1.15. Because of this line change: https://github.com/apache/drill/commit/5fff1d8bff899e1af551c16f26a58b6b1d033ffb#diff-274673e64e6f54be595a8703753123b0R115