Multiple element types in 1 index

->getElements(callable $queries)

This function can be used to query multiple different Element types. It should return an array of ElementQuery objects.

->getElements(function () {
    return [
        Entry::find()->section('blog'),
        Category::find()->group('blogCategories'),
    ];
});

Important

When ->getElements() is used, ->criteria() and ->elementType() are ignored. Combining elementTypes also changes the ->transformer() function - that should be addapted to use \craft\base\Element $element as an argument:

->transformer(function (\craft\base\Element $element) {
    return [
        'title' => $element->title
    ];
})