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https://issues.apache.org/jira/browse/LUCENE-9705?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17274514#comment-17274514
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Ignacio Vera commented on LUCENE-9705:
--------------------------------------

There should be no implication for the users. We are constantly introducing new 
codecs, normally due to a [change in one the underlaying index 
formats|https://github.com/apache/lucene-solr/pull/973] or a [new index 
format|https://github.com/apache/lucene-solr/pull/1930].

In Lucene 9.0 we are introducing already a new codec because we are introducing 
the new Vectors format. We are only suggesting to create a new version for all 
existing formats in this new codec so we can 1) hopefully eliminate technical 
debt 2) it will help with LUCENE-9047.
  

> Move all codec formats to the o.a.l.codecs.Lucene90 package
> -----------------------------------------------------------
>
>                 Key: LUCENE-9705
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9705
>             Project: Lucene - Core
>          Issue Type: Wish
>            Reporter: Ignacio Vera
>            Priority: Major
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Current formats are distributed in different packages, prefixed with the 
> Lucene version they were created. With the upcoming release of Lucene 9.0, it 
> would be nice to move all those formats to just the o.a.l.codecs.Lucene90 
> package (and of course moving the current ones to the backwards-codecs).
> This issue would actually facilitate moving the directory API to little 
> endian (LUCENE-9047) as the only codecs that would need to handle backwards 
> compatibility will be the codecs in backwards codecs.
> In addition, it can help formalising the use of internal versions vs format 
> versioning ( LUCENE-9616)
>  



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