The question came up off-list again recently, so a few days ago I added a "Building the Solr index from the Reuters data" section to the wiki at:
https://github.com/evolvingweb/ajax-solr/wiki/Reuters-tutorial
Assuming the ReutersService.java file still works in Solr 4, it should be able to import the data. If you give it a try and it works, we can update the instructions - if not, we can see if we can debug it.
Why do you need the Reuters data? You can follow the tutorial by using the hosted Solr index at
http://evolvingweb.ca/solr/reuters/, or you can use a Solr index with your own data and just change things appropriately in the tutorial.
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