edlp_d8/sites/all/modules/contrib/search/search_api/tests/search_api_test_hooks/search_api_test_hooks.module

<?php

/**
 * @file
 * Tests all the hooks defined by the Search API module.
 */

use Drupal\search_api\Query\QueryInterface;
use Drupal\search_api\Query\ResultSetInterface;
use Drupal\search_api\Utility\Utility;

/**
 * Implements hook_search_api_query_TAG_alter().
 */
function search_api_test_hooks_search_api_query_andrew_hill_alter(QueryInterface &$query) {
  // Exclude the node with ID 2 from the search results.
  $query->setOption('tag query alter hook', TRUE);
  $index = $query->getIndex();
  $fields = $index->getFields();
  foreach ($index->getDatasources() as $datasource_id => $datasource) {
    if ($datasource->getEntityTypeId() == 'node') {
      $field = Utility::createCombinedId($datasource_id, 'nid');
      if (isset($fields[$field])) {
        $query->addCondition($field, 2, '<>');
      }
    }
  }
}

/**
 * Implements hook_search_api_results_TAG_alter().
 */
function search_api_test_hooks_search_api_results_andrew_hill_alter(ResultSetInterface &$results) {
  drupal_set_message('Llama');
}