You may need to restart the Solr / Jetty services to apply any changes made in your collection config. To do this run the following command.
Example ColdFusion 11 Linux
cd /opt/coldfusion11/cfusion/jetty
sudo ./cfjetty restart
Example ColdFusion 10 Linux
cd /opt/coldfusion10/cfusion/jetty sudo ./cfjetty restart
Other options are [start|stop|restart]
NOTE: Replace the path to the ColdFusion Jetty folder on your setup.