Issue #3238635 by drunken monkey, mkalkbrenner: Deprecated...

Search API Autocomplete 1.x, dev (xxxx-xx-xx):

----------------------------------------------

- #3238635 by drunken monkey, mkalkbrenner: Deprecated

  AutocompleteBackendInterface in favor of the one in Search API.

- #3224354 by drunken monkey: Fixed service container error after module

  upgrade.

- #3228452 by drunken monkey: Fixed test failures against Drupal 9.3.x.

namespace Drupal\search_api_autocomplete;

@trigger_error('\Drupal\search_api_autocomplete\AutocompleteBackendInterface is deprecated in search_api_autocomplete:8.x-1.6 and is removed from search_api_autocomplete:2.0.0. Use \Drupal\search_api\Contrib\AutocompleteBackendInterface instead. See https://www.drupal.org/node/3256202.', E_USER_DEPRECATED);

use Drupal\search_api\Query\QueryInterface;

use Drupal\search_api\Backend\BackendInterface;

 *

 * Please note that this interface is purely documentational. You shouldn't, and

 * can't, implement it explicitly (unless your module is depending on this one).

 *

 * @deprecated in search_api_autocomplete:8.x-1.6 and is removed from

 *   search_api_autocomplete:2.0.0. Use

 *   \Drupal\search_api\Contrib\AutocompleteBackendInterface instead.

 *

 * @see https://www.drupal.org/node/3256202

 */

interface AutocompleteBackendInterface extends BackendInterface {

use Drupal\Core\Form\FormStateInterface;

use Drupal\Core\Language\LanguageManagerInterface;

use Drupal\Core\Plugin\PluginFormInterface;

use Drupal\search_api\Contrib\AutocompleteBackendInterface as NewAutocompleteBackendInterface;

use Drupal\search_api\IndexInterface;

use Drupal\search_api\Plugin\PluginFormTrait;

use Drupal\search_api\Query\QueryInterface;

use Drupal\search_api\SearchApiException;

use Drupal\search_api_autocomplete\AutocompleteBackendInterface;

use Drupal\search_api_autocomplete\AutocompleteBackendInterface as OldAutocompleteBackendInterface;

use Drupal\search_api_autocomplete\SearchInterface;

use Drupal\search_api_autocomplete\Suggester\SuggesterPluginBase;

use Symfony\Component\DependencyInjection\ContainerInterface;

    catch (SearchApiException $e) {

      return NULL;

    }

    if ($server->supportsFeature('search_api_autocomplete') || $backend instanceof AutocompleteBackendInterface) {

    if ($server->supportsFeature('search_api_autocomplete')

        || $backend instanceof NewAutocompleteBackendInterface

        || $backend instanceof OldAutocompleteBackendInterface) {

      return $backend;

    }

    return NULL;