My documents range from a couple of kilbytes to tens of megabytes and most
things work fine. Beware the plain highlighter on long string fields but
otherwise you are probably ok. Its certainly less efficient to store huge
documents because when you want to return portions of them (other than
their id) the whole document has to be deserialized. Unless you use stored
fields which most folks don't do so you'd be less charted territory.
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