The release of LuSql has been announced on a few email lists:
LuSql is a high-performance, simple tool for indexing data held in a DBMS into a Lucene index. It can use any JDBC-aware SQL database.
It includes a tutorial with a series of increasingly complex use cases, showing how article metadata held in a series of MySql tables can be indexed and how file system files containing full-text can also be indexed.
It has been tested extensively, including using 6.4 million metadata and full-text records to produce a 86GB index in 13.5 hours.
It is licensed with the Apache 2.0 license.