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https://issues.apache.org/jira/browse/SOLR-13681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16902179#comment-16902179
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Christine Poerschke commented on SOLR-13681:
--------------------------------------------
Attached initial partial patch is for an {{indexSort}} element within the
{{indexConfig}} element in {{solrconfig.xml}} configuration.
Illustration:
{code}
<indexConfig>
<indexSort>timestamp desc</indexSort>
</indexConfig>
{code}
Related Solr Ref Guide documentation:
* [https://lucene.apache.org/solr/guide/8_1/indexconfig-in-solrconfig.html]
> 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.patch
>
>
> 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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