javanna commented on PR #15565:
URL: https://github.com/apache/lucene/pull/15565#issuecomment-4235923103

   Thanks for opening this PR @gaobinlong ! I had a quick look and my 
observations are similar to those I had at 
https://github.com/apache/lucene/pull/15557#issuecomment-4235791234 . We are 
introducing a new public collector manager that is only used in tests code, 
while the grouping collector code (`GroupingSearch`) requires some rework to 
rely on collector managers. I wonder if we should start with working on that, 
which looks though involving, or simply update the test so that it no longer 
relies on a collector manager.
   
   All in all an important longer term question is how are grouping users going 
to move from collectors to collector managers. Lucene should probably include 
the building blocks for them to do so, and we need to define which those are.


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