This might be more of a Lucene question, but a quick google didn't throw up 
anything.

Has anyone done/seen any benchmarking on indexing performance (overhead) 
due to using doc values?

I often index quite large JSON objects, with many fields (eg 50), I'm 
trying to get a feel for whether I can just let all of them be doc values 
on the off chance I'll want to aggregate over them, or whether I need to 
pick beforehand which fields will support aggregation.

(A related question: presumably allowing a mix of doc values fields and 
"legacy" fields is a bad idea, because if you use doc values fields you 
want a low max heap so that the file cache has lots of memory available, 
whereas if you use the field cache you need a large heap - is that about 
right, or am i missing something?)

Thanks for any insight!

Alex
Ikanow

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