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https://issues.apache.org/jira/browse/SOLR-13681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17849358#comment-17849358
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David Smiley commented on SOLR-13681:
-------------------------------------

I noticed this ticket is "minor" priority but if it elevates index sorting to 
something we can all know/understand and use easily – it's a big win

> 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
>  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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