I suspect when you did the upgrade you kept the same configs. The /export
handler is an implicit handler in 6.6 so if you see any reference to
/export handler in the solrconfig remove it.
The /export hander does only return json or javabin in Solr 6.6.
Joel Bernstein
http://joelsolr.blogspot.com/
Hi,
We recently upgraded to solr version 6.6.0, and now the /export RequestHandler
only returns xml (with wt=json or not). Before, with version 5.4.1, we were
getting json.
The manual clearly says that the default should be json:
https://lucene.apache.org/solr/guide/6_6/exporting-result-sets.htm