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https://issues.apache.org/jira/browse/LUCENE-5971?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ryan Ernst updated LUCENE-5971:
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    Attachment: LUCENE-5971.patch

This patch does the following:
* Removes CreateBackwardsCompatibilityIndex class, which was just to avoid 
tests from running the index creation methods.  Instead, it uses assumeTrue 
methods, and requires passing -Dtests.bwcdir when creating backcompat indexes.
* Renames all backcompat index files to contain the exact toString of their 
version, instead of a squash/minified variant.  This allows using {{Version}} 
parsing and comparison for checking all versions have a test (and for future 
tests, if needed as was in the past when older codecs did not support certain 
features).
* Adds {{addBackcompatIndexes.py}} script, which was extracted from 
{{bumpVersion.py}}
* Tweaks {{TestBackwardsCompatibility.testAllVersionsTested}} to allow a single 
"missing" test, which could be when we are in the middle of releasing a new 
version (so tests don't break as soon as a new constant is added to {{Version}})

> Separate backcompat creation script from adding version
> -------------------------------------------------------
>
>                 Key: LUCENE-5971
>                 URL: https://issues.apache.org/jira/browse/LUCENE-5971
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Ryan Ernst
>         Attachments: LUCENE-5971.patch
>
>
> The recently created {{bumpVersion.py}} attempts to create a new backcompat 
> index if the default codec has changed.  However, we now want to create a 
> backcompat index for every released version, instead of just when there is a 
> change to the default codec.
> We should have a separate script which creates the backcompat indexes.  It 
> can even work directly on the released artifacts (by pulling down from 
> mirrors once released), so that there is no possibility for generating the 
> index from an incorrect svn/git checkout.



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