Avoid tokenized unique keys in Solr index.
Avoid tokenized unique keys in Solr index.

See:
https://lostechies.com/ryansvihla/2016/04/06/dont-use-textfield-for-your
-unique-key-in-solr/ and
http://stackoverflow.com/questions/37301852/datastax-search-node-warning
s-after-upgrade-to-dse-4-8-7

DC4DS/datastax-xml-demo,CodaAzzurra/datastax-xml-demo