http://lucene.apache.org/java/2_3_1/api/core/org/apache/lucene/search/MultiPhraseQuery.html
for the example \"Microsoft app*\", he says use IndexReader.term()
You need to iterate on TermEnum to get the terms. You can iterate on the TermEnum to get terms starting with "app" as follows.
TermEnum te = reader.terms(new Term("field", "app"));
List<Term> termList = new LinkedList<Term>();
while(te.next()) {
Term t = te.term();
if (!t.field().equals("field") || !t.text().startsWith("app")) {
break;
}
termList.add(t);
}
Term[] terms = termList.toArray(new Term[0]);