6 invocations of hook_update_index()

SearchExactTest::testExactQuery in drupal/core/modules/search/lib/Drupal/search/Tests/SearchExactTest.php
Tests that the correct number of pager links are found for both keywords and phrases.
SearchNodeAccessTest::testPhraseSearchPunctuation in drupal/core/modules/search/lib/Drupal/search/Tests/SearchNodeAccessTest.php
Tests that search returns results with punctuation in the search phrase.
SearchRankingTest::testDoubleRankings in drupal/core/modules/search/lib/Drupal/search/Tests/SearchRankingTest.php
Verifies that if we combine two rankings, search still works.
SearchRankingTest::testHTMLRankings in drupal/core/modules/search/lib/Drupal/search/Tests/SearchRankingTest.php
Test rankings of HTML tags.
SearchRankingTest::testRankings in drupal/core/modules/search/lib/Drupal/search/Tests/SearchRankingTest.php
search_cron in drupal/core/modules/search/search.module
Implements hook_cron().