thank you, Erick, you're right, the maxScore of document within each group is more effective than the sum of scores in a group, especially some use-case just as your assumption(group 1 could have 10M documents all with a score of .01 and group 2 could have 1 document with a score of 1,000 and group 1 would sort first) ,but the function is required by the client, can you tell me the way how to achieve it ?
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