Ok, sorry but the issue was located between my keyboard and my chair. The field "_collection_id" is required in the schema and not filled in my update request.
As the exception didn't warn me about any required field, I didn't look at this. Thanks anyway, Ben -- View this message in context: http://lucene.472066.n3.nabble.com/Exception-writing-document-to-the-index-possible-analysis-error-tp4174845p4174936.html Sent from the Solr - User mailing list archive at Nabble.com.