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https://issues.apache.org/jira/browse/LUCENE-5940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14132382#comment-14132382
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Robert Muir commented on LUCENE-5940:
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Actually 5.0 doesn't even need to read 4.x indexes. I had forgotten when I
opened this JIRA issue that
we already voted on this in 2010. (this vote passed).
{noformat}
[VOTE] Take 2: Open up a separate line for unstable Solr/Lucene development
This is a vote for the proposal discussed on the 'Proposal about
Version API "relaxation"' thread. This thread replaces the first
VOTE thread!
The vote is to open up a separate parallel line of development, called
unstable (on trunk), where non-back-compatible changes, slated for the
next major release, may be safely developed.
But it's not a free for all: the back compat break must still be
carefully tracked in detail (maybe in CHANGES, maybe in a separate
more detailed "guide" -- tbd), including migration instructions, so
that this becomes the "migration guide" on how users can move to the
new major release. If there are changes that break the index, we will
try very hard to create an index migration tool.
{noformat}
> change index backwards compatibility policy.
> --------------------------------------------
>
> Key: LUCENE-5940
> URL: https://issues.apache.org/jira/browse/LUCENE-5940
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Robert Muir
>
> Currently, our index backwards compatibility is unmanageable. The length of
> time in which we must support old indexes is simply too long.
> The index back compat works like this: everyone wants it, but there are
> frequently bugs, and when push comes to shove, its not a very sexy thing to
> work on/fix, so its hard to get any help.
> Currently our back compat "promise" is just a broken promise, because we
> cannot actually guarantee it for these reasons.
> I propose we scale back the length of time for which we must support old
> indexes.
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