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https://issues.apache.org/jira/browse/SOLR-3146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13212469#comment-13212469
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Torin Danil commented on SOLR-3146:
-----------------------------------
I think there are a lot of features in upcoming lucene4: starting with
NRTManager, and ending with automata support (with whole shebang of regexp
queries, fast fuzzy and spellcheck)
All of these need to have hooks in SOLR (I might be mistaken, but from what
I've seen in trunk, those are completely missing)
So I think it's acceptable that old solr users won't get new features, just
some sane defaults, but to experience the full power of new release will be
required to migrate.
> Create migration guide from 3.x to 4.0
> --------------------------------------
>
> Key: SOLR-3146
> URL: https://issues.apache.org/jira/browse/SOLR-3146
> Project: Solr
> Issue Type: Task
> Components: documentation
> Reporter: Jan Høydahl
> Fix For: 4.0
>
>
> Spinoff from SOLR-3141:
> {quote}
> Perhaps an official migration guide on the CMS would be helpful too when 4.0
> hits the road. Such a guide would be more in-depth than the upgrading notes
> in CHANGES. We could have a paragraph about optimize/forceMerge, and another
> paragraph about softCommit/commitWithin as preferred to explicit commit,
> which is also a huge mistake many people do, they do over-committing!
> {quote}
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