SegmentInfo and SegmentInfos (separately).  You can compare the
version headers at the top of SegmentInfos, in 2.9.x vs 3.0.x, to see
which ones can go.

FieldInfos can lose its FORMAT_PRE I think, and TermVectorsReader can
lose most of its old formats.

Mike

On Thu, May 27, 2010 at 11:13 AM, Shai Erera <[email protected]> wrote:
> Ok ... that was rather fast and short !
>
> So regarding trunk, is SegmentInfos the only place to look in? Can you give
> me more pointers? I'd like to create an issue for that (not sure I'll do it
> myself though), so capturing all the information there would be good.
>
> Shai
>
> On Thu, May 27, 2010 at 6:10 PM, Michael McCandless
> <[email protected]> wrote:
>>
>> On Thu, May 27, 2010 at 11:08 AM, Shai Erera <[email protected]> wrote:
>> > Well ... we could remove the 1.9 indexes (though that's not so valuable)
>>
>> We may as well?
>>
>> > But in trunk, we can remove all 2.x related code already no?
>>
>> Yes, you're right!
>>
>> Mike
>>
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