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https://issues.apache.org/jira/browse/SOLR-2259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972150#action_12972150
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Robert Muir commented on SOLR-2259:
-----------------------------------
I committed part 2 in revision 1050064.
> Improve analyzer/version handling in Solr
> -----------------------------------------
>
> Key: SOLR-2259
> URL: https://issues.apache.org/jira/browse/SOLR-2259
> Project: Solr
> Issue Type: Task
> Reporter: Robert Muir
> Fix For: 3.1, 4.0
>
> Attachments: SOLR-2259.patch, SOLR-2259.patch, SOLR-2259part2.patch
>
>
> We added Version for backwards compatibility support in Lucene.
> We use this to fire deprecated code to emulate old version to ensure index
> backwards compat.
> Related: we deprecate old analysis components and eventually remove them.
> To hook into Solr, at first it defaulted to Version 2.4 emulation everywhere,
> with the example having the latest.
> if you don't specify a version in your solrconfig, it defaults to 2.4 though.
> However, as of LUCENE-2781 2.4 is removed: but users with old configs that
> don't specify a version should not be silently "upgraded" to the Version 3.0
> emulation... this is bad.
> Additionally, when users are using deprecated emulation or using deprecated
> factories they might not know it, and it might come as a surprise if they
> upgrade, especially if they arent looking at java apis or java code.
> I propose:
> # in trunk: we make the solrconfig luceneMatchVersion mandatory.
> This is simple: Uwe already has a method that will error out if its not
> present, we just use that.
> # in 3.x: we warn if you don't specify luceneMatchVersion in solrconfig:
> telling you that its going to be required in 4.0 and that you are defaulting
> to 2.4 emulation.
> For example: Warning: luceneMatchVersion is not specified in solrconfig.xml.
> Defaulting to 2.4 emulation. You should at some point declare and reindex to
> at least 3.0, because 2.4 emulation is deprecated in 3.x and will be removed
> in 4.0. This parameter will be mandatory in 4.0.
> # in 3.x,trunk: we warn if you are using a deprecated matchVersion constant
> somewhere in general, even for a specific tokenizer, telling you that you
> need to at some point reindex with a current version before you can move to
> the next release.
> For example: Warning: you are using 2.4 emulation, at some point you need to
> bump and reindex to at least 3.0, because 2.4 emulation is deprecated in 3.x
> and will be removed in 4.0
> # in 3.x,trunk: we warn if you are using a deprecated TokenStreamFactory so
> that you know its going to be removed.
> For example: Warning: the ISOLatin1FilterFactory is deprecated and will be
> removed in the next release. You should migrate to ASCIIFoldingFilterFactory.
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