gmarouli commented on issue #15548:
URL: https://github.com/apache/lucene/issues/15548#issuecomment-3920264594

   First let's identify what we want to achieve here:
   
   1. Introduce configurable `missingValue` one for parent level and one for 
child level, just like we have the two sorting order configurations.
   2. Expand the "missing" scenarios to also be able to identify when a parent 
has children with missing values and use the child missing value there. 
   
   **Missing value usage scenarios**
   
   - When a parent has no children, then we use the `parentMissingValue`.
   - When a child does not have the sorting field, then we use the 
`childMissingValue` when sorting the parent.


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