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https://issues.apache.org/jira/browse/LUCENE-2141?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-2141.
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    Fix Version/s:     (was: 4.0)
       Resolution: Duplicate

Dup of LUCENE-2380.

> Make String and StringIndex in field cache more RAM efficient
> -------------------------------------------------------------
>
>                 Key: LUCENE-2141
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2141
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Search
>            Reporter: Michael McCandless
>
> Once flex has landed and LUCENE-1990 is done, we should improve the RAM 
> efficiency of String and StringIndex.
> The text data can be stored in native UTF8 (saves decode when loading), and 
> as byte[] blocks (saves GC load and high RAM overhead of individual strings).
> And with packed unsigned ints we can save alot for cases that don't have that 
> many unique string values.

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