private void DoTestNorms(Directory dir)
{
AddDocs(dir, 12, true);
IndexReader ir = IndexReader.Open(dir, false);
VerifyIndex(ir);
ModifyNormsForF1(ir);
IndexReader irc = (IndexReader) ir.Clone(); // IndexReader.open(dir, false);//ir.clone();
VerifyIndex(irc);
ModifyNormsForF1(irc);
IndexReader irc3 = (IndexReader) irc.Clone();
VerifyIndex(irc3);
ModifyNormsForF1(irc3);
VerifyIndex(irc3);
irc3.Flush();
irc3.Close();
}