If you want to delete all docs, why don't you just drop the database?
Or you can use the bulk operations in Ektorp:
List<Object> bulkDocs = ...
Sofa toBeDeleted = ...
bulkDocs.add(BulkDeleteDocument.of(toBeDeleted));
db.executeBulk(bulkDocs);
read more here: http://ektorp.org/reference_documentation.html#d100e642