Is there any way to determine the amount of memory a specific document will or is taking up? It doesn't need to be done in a query (as I don't think there is one). Would it be possible to write a function that takes in the JSON for a document, it's mapping, and returns memory usage? If so, how would that function work?
What sort of memory though - field data, global ordinals, doc values cached by OS, query/aggs?
Basically, it's complicated and I don't think there would be a single way of doing this. The explain API may be able to cover this, but I think there'd be a lot of changes to do it.
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