dweiss opened a new issue, #12883:
URL: https://github.com/apache/lucene/issues/12883
### Description
I came across this one by stress-testing the package with -Dtests.iters=200.
Occasional hiccups in unified highlighter tests, for example:
```
gradlew :lucene:highlighter:test --tests
"org.apache.lucene.search.uhighlight.TestUnifiedHighlighter.testOneSentence"
-Ptests.seed=24C86DF477CBF09B:8FFE031B3019BA09
```
The test expects documents in indexing order:
```
body.setStringValue("This is a test.");
iw.addDocument(doc);
body.setStringValue("Test a one sentence document.");
iw.addDocument(doc);
IndexReader ir = iw.getReader();
iw.close();
IndexSearcher searcher = newSearcher(ir);
UnifiedHighlighter highlighter = randomUnifiedHighlighter(searcher,
indexAnalyzer);
Query query = new TermQuery(new Term("body", "test"));
TopDocs topDocs = searcher.search(query, 10, Sort.INDEXORDER);
assertEquals(2, topDocs.totalHits.value);
String[] snippets = highlighter.highlight("body", query, topDocs);
assertEquals(2, snippets.length);
assertEquals("This is a <b>test</b>.", snippets[0]);
assertEquals("<b>Test</b> a one sentence document.", snippets[1]);
```
But for some reason they're swapped.
I didn't look into it but it also happens with other tests (rarely).
### Version and environment details
_No response_
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