Hi, I have done some research about SolR document with a very high number of fields.
In the mailing list archive there's a thread about this subject which answers my question : http://lucene.472066.n3.nabble.com/Dynamic-fields-performance-question-td476337.html . By the way, this post is a little old and I would like to know if it's still applicable for a recent SolR version (4.5) ? Thanks
