Greetings to all. I have such a question. There is such a plugin "Ajax Search Suggestions" and how to configure it correctly for the theme "Epsilon Osclass Theme" and "osclassv8.2.1". So that ads are displayed during the initial search. And what should I write in the "Search field ID" window?

Never seen it.
iD will mean identifier of input... But theme may not use identifier on it so you might need to add one (id="something")

If anything, this plugin

(id="something")

No, that's not the word, I checked that it works on older versions of the templates with the word "query", but neither this nor the new word that you wrote does not work in the new templates "Epsilon". Is there some other word, can you tell me which ID is used instead of "query"?

It depends on ID of input itself.
Some old themes set ID of input to "query".