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 voidLuceneIndexFactory 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
 * @param value user object to be serialized into index
 */
public interface LuceneSerializer {
  Collection<Document> toDocuments(LuceneIndex index, Object value);
}

public class Customer implements Serializable {
  private String name;
  private PersonCollection<String> contactphoneNumbers; // search nested object 
  private Collection<Person> contacts;
  private Page[] myHomePages;
  ......
}
public class Person implements Serializable {
  private String name;
  private String email;
  private int revenue;
  private String address;
  private String[] phoneNumbers;
  private Page homepage;
  .......
}
public class Page implements Serializable {
  private int id; // search integer in int format
  private String title;
  private String content;
  ......
}

// Get LuceneService
LuceneService luceneService = LuceneServiceProvider.get(cache);

// Create Index on fields, some are fields in nested objects:
luceneService.createIndexFactory().setLuceneSerializer(new FlatFormatSeralizerFlatFormatSerializer()) /* an out-of-box LuceneSerializer implementation */
      .addField("name").addField("contactcontacts.name").addField("contactcontacts.email").addField("contactcontacts.address").addField("contactcontacts.homepage.title")
      .create("customerIndex", "Customer");

// Now to create region
Region CustomerRegion = ((Cache)cache).createRegionFactory(shortcut).create("Customer");