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https://issues.apache.org/jira/browse/LUCENE-7671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15925361#comment-15925361
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Michael McCandless commented on LUCENE-7671:
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Hi [~k317h], sorry, I changed jobs and got super busy but I will try to have a
look at this again soon ;)
Net/net I think it's reasonable to make it easier to upgrade an index w/o
having to close and open a new IndexWriter to set a new merge policy ...
> Enhance UpgradeIndexMergePolicy with additional options
> -------------------------------------------------------
>
> Key: LUCENE-7671
> URL: https://issues.apache.org/jira/browse/LUCENE-7671
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Keith Laban
>
> Enhance UpgradeIndexMergePolicy to be a MergePolicy that can be used outside
> the scope the IndexUpgrader.
> The enhancement aims to allow the UpgradeIndexMergePolicy to:
> 1) Delegate normal force merges to the underlying merge policy
> 2) Enable a flag that will explicitly tell UpgradeIndexMergePolicy when it
> should start looking for upgrades.
> 3) Allow new segments to be considered to be merged with old segments,
> depending on underlying MergePolicy.
> 4) Be configurable for backwards compatibility such that only segments
> needing an upgrade would be considered when merging, no explicit upgrades.
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