jainankitk commented on PR #14413:
URL: https://github.com/apache/lucene/pull/14413#issuecomment-2758741304

   > Can you explain why we need two impls? I would have assumed that the 
ConcurrentQueryProfilerBreakdown could also be used for searches that are not 
concurrent?
   
   `ConcurrentQueryProfilerBreakdown` maintains separate instance of 
`QueryProfileBreakdown` for each segment. In the context method, 
`ConcurrentQueryProfilerBreakdown` returns corresponding 
`QueryProfileBreakdown` object for each segment. 
   
   ```
     @Override
     public QueryProfilerBreakdown context(LeafReaderContext context) {
       return this;
     }
   ```
   
   Hence, I felt we don't need to take the overhead of creating breakdown per 
segment and then merging it together during response. That being said, 
eventually we can keep just `ConcurrentQueryProfilerBreakdown` if we prefer 
that for simplicity.


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