Remove remains of the "new" indexer

[trancexpress]

See: https://bugs.eclipse.org/bugs/show_bug.cgi?id=579203

There is still many code comments in jdt.core which refers to the "new index" which was removed.
example:

  /**
   * The new indexer is disabled, see [bug 544898](https://bugs.eclipse.org/bugs/show_bug.cgi?id=544898)
   */
//	private Indexer indexer = Indexer.getInstance();

further hits can be found with full text search for "new index", "new Indexer", "544898"