Assume I already had lot of documents inside ES and each document represent
But now I want to update some files' fields, so I need to find the
document, get its id, and then apply the _update operation.
And If I have n document to do such things and there are m document inside
the ES, the performance to search the desired document to get its id is
O(n*m), right? Because each finding operation needs to scan entire
documents inside the index, does it exist any way to find the desired
document with unique key, return immediately when found it?
If so, it's really not a good option when to update a document's field. I
am wondering what's the suggested workflow to update some file without
knowing its id first.
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