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https://issues.apache.org/jira/browse/LUCENE-8200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16400327#comment-16400327
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ASF subversion and git services commented on LUCENE-8200:
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Commit 12fc8c7ae0090ab4c1fee97000f17ecc8c250752 in lucene-solr's branch
refs/heads/master from [~simonw]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=12fc8c7 ]
LUCENE-8200: Add dummy doc before forceMerge in TestIndexWriter to force a new
segment
> Allow doc-values to be updated atomically together with a document
> -------------------------------------------------------------------
>
> Key: LUCENE-8200
> URL: https://issues.apache.org/jira/browse/LUCENE-8200
> Project: Lucene - Core
> Issue Type: Improvement
> Affects Versions: 7.4, master (8.0)
> Reporter: Simon Willnauer
> Assignee: Simon Willnauer
> Priority: Major
> Attachments: LUCENE-8200.patch, LUCENE-8200.patch, LUCENE-8200.patch
>
>
> Today we can only update a document by deleting all previously indexed
> documents for the given term. In some cases like when deletes are not `final`
> in the way that documents that are marked as deleted should not be merged
> away a `soft-delete` is needed which is possible when doc-values updates can
> be done atomically just like delete and add in updateDocument(s)
>
> This change introduces such a soft update that reuses all code paths from
> deletes to update all previously updated documents for a given term instead
> of marking it as deleted. This is a spinnoff from LUCENE-8198
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