Hotfix: Restore index.max_result_window to Elasticsearch default of 10000 (#2056)

* Restore index.max_result_window to Elasticsearch default of 10000

* Fix a test

Author: rinatkhaziev

search/includes/classes/class-search.php

@@ -11,7 +11,7 @@ class Search {
 	public const QUERY_INTEGRATION_FORCE_ENABLE_KEY = 'vip-search-enabled';
 	public const SEARCH_ALERT_SLACK_CHAT = '#vip-go-es-alerts';
 	public const SEARCH_ALERT_LEVEL = 2; // Level 2 = 'alert'
-	public const MAX_RESULT_WINDOW = 9000;
+	public const MAX_RESULT_WINDOW = 10000;
 	/**
 	 * Empty for now. Will flesh out once migration path discussions are underway and/or the same meta are added to the filter across many
 	 * sites.

tests/search/test-class-search.php

@@ -2994,7 +2994,7 @@ public function limit_max_result_window_data() {
 			],
 			[
 				'input' => 10000,
-				'expected' => 9000,
+				'expected' => 10000,
 			],
 		];
 	}