I try those to requests:
http://localhost:8080/solr/core/select/?q=title:mario&start=0&rows=10&wt=xml works fine
http://localhost:8080/solr/core/select/?q=title:mario&start=0&rows=10&wt=json doesn’t work!
returns
HTTP Status 400 – undefined field tags
type Status report
message undefined field tags
description The request sent by the client was syntactically incorrect (undefined field tags).
Can anyone advise please?
I solved the issue.
For people who may encounter the same weird behaviour, how I got there:
I changed the data-dir property to another directory (a data-dir of another SOLR core, with different database, fields..)
Just re-indexing the index solved the issue.