public LuceneIndexFactory {
 /**
 * Configure the way objects are converted to lucene documents for this lucene index
 * @param luceneSerializer A callback which converts a region value to a 
 * Lucene document or documents to be stored in the index.
 */
 public LuceneIndexFactory setLuceneSerializer(LuceneSerializer luceneSerializer);
}  
  
/**
 * An interface for writing the fields of an object into a lucene document
 * The region key will be added as a field to the returned documents.
 * @param index lucene index
 */
public interface LuceneSerializer {
  Collection<Document> toDocuments(LuceneIndex index, Object value);
}