I'm relatively new to Lucene and am in the process of upgrading from 4.0 to 4.3.1. I'm trying to figure out if I need to leave my version at LUCENE_40 or if it is safe to change it to LUCENE_43. Does this parameter directly determine the index format? I have some existing indexes from 4.0 but am fine with whatever changes Lucene makes to them; I'm not concerned with the internal format. But if I set my version to LUCENE_43 will the IndexReader/Writer not work with my old indexes?
Regards, Tommy
