Log how many result found for a slow query

[qiao-meng-zefr]

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Describe the feature:
Can we add this to the slow log:

• how many results/hits found for the query.

I understand it's probably going to be a per shard number, but will be still very useful for performance tuning and so on.

Appreciate it!

[ghost]

this is good idea and help developer to debug their slow-query further

[shibing624]

thx

[qiao-meng-zefr]

I know it's been a while, but still think this is a great debugging tool for elasticsearch user. Is there any plan to add this feature or at least re-evaluate it?

Thanks elastic team!

[jasontedor]

I opened #29034.