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https://issues.apache.org/jira/browse/LUCENE-1960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769507#action_12769507
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Michael Busch commented on LUCENE-1960:
---------------------------------------

{quote}
Can't we detect that we're dealing w/ an older version segment and not use 
addRawDocuments when merging them (and uncompress when we merge)?
{quote}

So then any 2.x index (including 2.9) would not be merged in the optimized way 
with 3.x. I'm actually not even sure how much of a slowdown this is. Did you 
(or anyone else) ever measure that? 

> Remove deprecated Field.Store.COMPRESS
> --------------------------------------
>
>                 Key: LUCENE-1960
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1960
>             Project: Lucene - Java
>          Issue Type: Task
>            Reporter: Michael Busch
>            Assignee: Michael Busch
>            Priority: Minor
>             Fix For: 3.0
>
>         Attachments: lucene-1960-1.patch, lucene-1960.patch
>
>
> Also remove FieldForMerge and related code.

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