I want to filter by titleKey when set searchLength is one character.
This issue is if I filter with character is 'i', 'd' or 'id' then the result response is full options of completer
Because I see you filter by return key.replace(/ /g, "_") + "id" + String(id);

Could you please make a new version with a sort change at function SearchableAutoCompleteString in ng-autocomplete.esm.js like this:

function SearchableAutoCompleteString(key, id) {
    if (id) {
        return key.replace(/ /g, "_") + "_id_" + String(id);
    }
    return key.replace(/ /g, "_");
}

This will support me and anyone just want to filter titleKey when set searchLength is one character so much. Thanks for your support. It's very important to me. Thanks again.