[I] IndexWriter loses track of parent field when documents fail to use it [lucene]

[via GitHub]

msokolov opened a new issue, #13340:
URL: https://github.com/apache/lucene/issues/13340

   ### Description
   
   This test fails with ` java.lang.IllegalArgumentException: can't add a 
parent field to an already existing index without a parent field`. If you index 
any documents in the index, using the parent field or no, then the test passes.
   
   ```  
   public void testParentFieldEmptyIndex() throws IOException {
       try (Directory dir = newMockDirectory()) {
         IndexWriterConfig iwc = new IndexWriterConfig(new 
MockAnalyzer(random()));
         iwc.setParentField("parent");
         try (IndexWriter writer = new IndexWriter(dir, iwc)) {
           writer.commit();
         }
         IndexWriterConfig iwc2 = new IndexWriterConfig(new 
MockAnalyzer(random()));
         iwc2.setParentField("parent");
         try (IndexWriter writer = new IndexWriter(dir, iwc2)) {
           writer.commit();
         }
       }
     }
   ```
   
   
   ### Version and environment details
   
   _No response_


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