4.0alpha doesn't read Umbraco/Lucene/Examine indexes, but 1.0.1 does

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What steps will reproduce the problem?
1. Using most current version 
(http://luke.googlecode.com/files/lukeall-4.0.0-ALPHA.jar), can't open current 
Umbraco/Lucene/Examine indexes, gives "format unsupported" error. Dropped back 
to 1.0.1 (http://luke.googlecode.com/files/lukeall-1.0.1.jar) and it reads fine.

What is the expected output? What do you see instead?
Error: Invalid directory at the location, check console for more information. 
Last exception:
org.apache.lucene.index.IndexFormatTooOldException: Format version is not 
supported (resource: 
SimpleFSIndexInput(path="\\w3\d$\inetpub\devclean\App_Data\TEMP\ExamineIndexes\E
xternal\Index\_5o6o.fdx")): 1 (needs to be between 2 and 3). This version of 
Lucene only supports indexes created with release 3.0 and later

What version of the product are you using? On what operating system?
4.0alpha, Windows 7

Please provide any additional information below.

Original issue reported on code.google.com by [email protected] on 21 Feb 2013 at 10:46