Something which may be interesting for other projects: 

For FranceTV, we have implemented Lucene indexing of content published
to the filesystem. This is done by maintaining a Lucene index which is
separate from the search engine we have on the editorial server. 

The changelist is 32335, and basically involves two new methods in
PublishToFile which can be overriden in derived classes
(indexSearchContent and unindexSearchContent). For computing the indexed
content, we use the Lucene Adapter class that's part of the existing
search engine.

The location of the PFS Lucene index is controlled with this section in
enterprise.init:

init com.arsdigita.cms.publishToFile.LuceneInitializer {
    // Settings for indexing PFS content with Lucene.
    luceneIndexLocation = "/tmp/lucene-index.dat";
}

And publishListener has to be changed to:

publishListener = "com.arsdigita.cms.publishToFile.LucenePublishToFile";

Documentation can be found in the JavaDoc of
com.arsdigita.cms.publishToFile and LucenePublishToFile, and in
//ps/proj/francetv/dev/ftvi/doc/lucene-pfs-indexing.html.


Expected results:


Additional info: