Using ScriptRunner in for Confluence 8.0.2 Data Center.
I finally found the class to disable Autocomplete for a user in their user settings, at least I'm pretty sure that's what it's for.
com.atlassian.confluence.pageobjects.page.user.EditUserEditorSettingsPage
And, of course, it's deprecated. 
It says:
Use EditUserEditorSettingsPage instead from maven module com.atlassian.confluence:confluence-webdriver-pageobjects. See the new README.
Of course, "the new README" goes to a link I can't access. I'm guessing internal Atlassian or just broken link.
Nothing under com.atlassian.confluence.webdriver.pageobjects looks remotely usable unless I'm looking in the wrong place.
Anyone have any ideas how to disable Autocomplete for a user now?