/** Build the example index. */
private void index() throws IOException {
IndexWriter indexWriter = new IndexWriter(indexDir, new IndexWriterConfig(FacetExamples.EXAMPLES_VER,
new WhitespaceAnalyzer(FacetExamples.EXAMPLES_VER)));
Document doc = new Document();
doc.add(new SortedSetDocValuesFacetField("Author", "Bob"));
doc.add(new SortedSetDocValuesFacetField("Publish Year", "2010"));
indexWriter.addDocument(config.build(doc));
doc = new Document();
doc.add(new SortedSetDocValuesFacetField("Author", "Lisa"));
doc.add(new SortedSetDocValuesFacetField("Publish Year", "2010"));
indexWriter.addDocument(config.build(doc));
doc = new Document();
doc.add(new SortedSetDocValuesFacetField("Author", "Lisa"));
doc.add(new SortedSetDocValuesFacetField("Publish Year", "2012"));
indexWriter.addDocument(config.build(doc));
doc = new Document();
doc.add(new SortedSetDocValuesFacetField("Author", "Susan"));
doc.add(new SortedSetDocValuesFacetField("Publish Year", "2012"));
indexWriter.addDocument(config.build(doc));
doc = new Document();
doc.add(new SortedSetDocValuesFacetField("Author", "Frank"));
doc.add(new SortedSetDocValuesFacetField("Publish Year", "1999"));
indexWriter.addDocument(config.build(doc));
indexWriter.close();
}