nick-boss-tech opened a new pull request, #4998:
URL: https://github.com/apache/solr/pull/4998

   🤖 *AI text below* 🤖 *(posted on behalf of Nick Shanin)*
   
   https://issues.apache.org/jira/browse/SOLR-17539
   
   After upgrading to Solr 9.6, users reported increased memory usage traced to 
the DocValues iterator reuse cache: wide `fl` globs (e.g. `fl=*`) pin iterators 
in the cache that the query never benefits from.
   
   This adds a `query.enableDocValuesIteratorCache` option in `solrconfig.xml` 
(default `true`, preserving current behavior). When disabled, 
`SolrDocumentFetcher` / `RealTimeGetComponent` bypass the new 
`DocValuesIteratorCache` for DocValues field loading, so wide field-list 
queries no longer pay the cache's memory cost. The option is exposed through 
the Config API (`EditableSolrConfigAttributes.json`) and documented in the ref 
guide (caches-warming, config-api); both bundled configsets set it explicitly.
   
   Tests: new `TestDocValuesIteratorCache` — green with Error Prone (4m16s); 
`SolrCoreTest` / `TestConfigOverlay` coverage for the config plumbing.
   
   Changelog: `changelog/unreleased/SOLR-17539.yml` (added)
   
   ### AI assistance
   
   AI agents assisted with research, implementation, review, and drafting. Nick 
Shanin directed the work and takes responsibility for this contribution.


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