These fields are not used by the new 1.6 Statistics, but are only related to the Statistics from previous DSpace releases.
Upgrade Process for Statistics
Example of rebuild and redeploy DSpace (only if you have configured your distribution in this manner)
First approach the traditional DSpace build process for updating
cd [dspace-source]/dspace mvn package cd [dspace-source]/dspace/target/dspace-installer ant -Dconfig=[dspace]/config/dspace.cfg update cp -R [dspace]/webapps/* [TOMCAT]/webapps
The last step is only used if you do not follow the recommended practice of configuring [dspace]/webapps as location for webapps in your servlet container (Tomcat, Resin or Jetty). If you only need to build the statistics, and don't make any changes to other web applications, you can replace the copy step above with:
cp -R dspace/webapps/solr TOMCAT/webapps
Again, only if you are not mounting [dspace]/webapps directly into your Tomcat, Resin or Jetty host (the recommended practice)
Restart your webapps (Tomcat/Jetty/Resin)
NOTE for developers: if you change the SOLR schema for statistics, you need to reindex existing SOLR stats data.
You can use the solr-reindex-statistics script to do this.