[jira] [Created] (SOLR-13681) make Lucene's index sorting directly configurable in Solr

["Christine Poerschke (JIRA)" <ji...@apache.org>]

Christine Poerschke created SOLR-13681:
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             Summary: 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


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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