The term "the documented" is correct and usable in written English.
For example, "The documented history of the indigenous population was instrumental in understanding their culture."
Dictionary
the documented
noun
An original or official paper relied upon as the basis, proof, or support of anything else, including any writing, book, or other instrument conveying information pertinent to such proof or support. Any material substance on which the thoughts of people are represented by any species of conventional mark or symbol.
synonyms
Exact(60)
Within an hour the documented case had arrived – from "an Egyptian" – in our mailboxes.
He also believes that the documented cases are just the tip of the iceberg.
Not to mention the documented disappearances, torture and imprisonment of dozens of journalists and political opponents.
"It was the documented evidence about the training which was the problem - not the training itself".
According to the study, half of the documented clan violence occurred between 2000 and 2004.
I will even overlook the documented existence of a song called Swallow My Gift.
And even some of the documented expenses were cited as exorbitantly priced, the report said.
The documented decline in listeners at orchestral concerts is sad but not surprising.
Does it in fact serve a patient's best interests to provide the documented substandard care?
Snyder's theories are bolstered by the documented cases in which sudden brain damage has produced savant abilities almost overnight.
Of course, in the spectrum of obligations a bee kid could carry, J.J.'s are nowhere near the documented extremes.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com