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https://issues.apache.org/jira/browse/SOLR-13681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17924252#comment-17924252
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David Smiley commented on SOLR-13681:
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Yes please do that. Major releases are indeed a time to simplify something,
removing old things, even if it breaks someone. If we're not sure if existing
users of some advanced feature like this will be compatible, I still think a
major release is okay. Just call out the risk/unknown in the upgrade notes
asciidoc file.
> make Lucene's index sorting directly configurable in Solr
> ---------------------------------------------------------
>
> Key: SOLR-13681
> URL: https://issues.apache.org/jira/browse/SOLR-13681
> Project: Solr
> Issue Type: New Feature
> Reporter: Christine Poerschke
> Priority: Minor
> Attachments: SOLR-13681-refguide-skel.patch, SOLR-13681.patch
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> History/Background:
> * SOLR-5730 made Lucene's SortingMergePolicy and
> EarlyTerminatingSortingCollector configurable in Solr 6.0 or later.
> * LUCENE-6766 make index sorting a first-class citizen in Lucene 6.2 or later.
> Current status:
> * In Solr 8.2 use of index sorting is only available via configuration of a
> (top-level) merge policy that is a SortingMergePolicy and that policy's sort
> is then passed to the index writer config via the
> {code}
> if (mergePolicy instanceof SortingMergePolicy) {
> Sort indexSort = ((SortingMergePolicy) mergePolicy).getSort();
> iwc.setIndexSort(indexSort);
> }
> {code}
> https://github.com/apache/lucene-solr/blob/releases/lucene-solr/8.2.0/solr/core/src/java/org/apache/solr/update/SolrIndexConfig.java#L241-L244
> code path.
> Proposed change:
> * in-scope for this ticket: To add direct support for index sorting
> configuration in Solr.
> * out-of-scope for this ticket: deprecation and removal of SortingMergePolicy
> support
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