diff --git a/phpBB/config/installer/container/services_install_data.yml b/phpBB/config/installer/container/services_install_data.yml
index df63d16d0d..5de00170e9 100644
--- a/phpBB/config/installer/container/services_install_data.yml
+++ b/phpBB/config/installer/container/services_install_data.yml
@@ -29,6 +29,16 @@ services:
         tags:
             - { name: install_data_install, order: 30 }
 
+    installer.install_data.create_search_index:
+        class: phpbb\install\module\install_data\task\create_search_index
+        arguments:
+            - '@config'
+            - '@installer.helper.container_factory'
+            - '%core.root_path%'
+            - '%core.php_ext%'
+        tags:
+            - { name: install_data_install, order: 40 }
+
     installer.module.data_install_collection:
         class: phpbb\di\ordered_service_collection
         arguments:
diff --git a/phpBB/language/en/install.php b/phpBB/language/en/install.php
index 264377e494..c2e741c6a7 100644
--- a/phpBB/language/en/install.php
+++ b/phpBB/language/en/install.php
@@ -297,9 +297,10 @@ $lang = array_merge($lang, array(
 	'TASK_CREATE_TABLES'				=> 'Creating tables',
 
 	// Install data
-	'TASK_ADD_BOTS'			=> 'Registering bots',
-	'TASK_ADD_LANGUAGES'	=> 'Installing available languages',
-	'TASK_ADD_MODULES'		=> 'Installing modules',
+	'TASK_ADD_BOTS'				=> 'Registering bots',
+	'TASK_ADD_LANGUAGES'		=> 'Installing available languages',
+	'TASK_ADD_MODULES'			=> 'Installing modules',
+	'TASK_CREATE_SEARCH_INDEX'	=> 'Creating search index',
 
 	// Install finish tasks
 	'TASK_INSTALL_EXTENSIONS'	=> 'Installing packaged extensions',
diff --git a/phpBB/phpbb/install/module/install_data/task/create_search_index.php b/phpBB/phpbb/install/module/install_data/task/create_search_index.php
new file mode 100644
index 0000000000..8a2f6aa1de
--- /dev/null
+++ b/phpBB/phpbb/install/module/install_data/task/create_search_index.php
@@ -0,0 +1,134 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\install\module\install_data\task;
+
+use phpbb\auth\auth;
+use phpbb\db\driver\driver_interface;
+use phpbb\event\dispatcher;
+use phpbb\config\config;
+use phpbb\install\helper\container_factory;
+use phpbb\language\language;
+use phpbb\search\fulltext_native;
+use phpbb\user;
+
+class create_search_index extends \phpbb\install\task_base
+{
+	/**
+	 * @var auth
+	 */
+	protected $auth;
+
+	/**
+	 * @var config
+	 */
+	protected $config;
+
+	/**
+	 * @var driver_interface
+	 */
+	protected $db;
+
+	/**
+	 * @var dispatcher
+	 */
+	protected $phpbb_dispatcher;
+
+	/**
+	 * @var language
+	 */
+	protected $language;
+
+	/**
+	 * @var user
+	 */
+	protected $user;
+
+	/**
+	 * @var string phpBB root path
+	 */
+	protected $phpbb_root_path;
+
+	/**
+	 * @var string PHP file extension
+	 */
+	protected $php_ext;
+
+	/**
+	 * Constructor
+	 *
+	 * @param config				$config				phpBB config
+	 * @param container_factory		$container			Installer's DI container
+	 * @param string				$phpbb_root_path	phpBB root path
+	 * @param string				$php_ext			PHP file extension
+	 */
+	public function __construct(config $config, container_factory $container,
+								$phpbb_root_path, $php_ext)
+	{
+		$this->auth				= $container->get('auth');
+		$this->config			= $config;
+		$this->db				= $container->get('dbal.conn');
+		$this->language			= $container->get('language');
+		$this->phpbb_dispatcher = $container->get('dispatcher');
+		$this->user 			= $container->get('user');
+
+		parent::__construct(true);
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function run()
+	{
+		// Make sure fulltext native load update is set
+		$this->config->set('fulltext_native_load_upd', 1);
+
+		$error = false;
+		$search = new fulltext_native(
+			$error,
+			$this->phpbb_root_path,
+			$this->php_ext,
+			$this->auth,
+			$this->config,
+			$this->db,
+			$this->user,
+			$this->phpbb_dispatcher
+		);
+
+		$sql = 'SELECT post_id, post_subject, post_text, poster_id, forum_id
+			FROM ' . POSTS_TABLE;
+		$result = $this->db->sql_query($sql);
+
+		while ($row = $this->db->sql_fetchrow($result))
+		{
+			$search->index('post', $row['post_id'], $row['post_text'], $row['post_subject'], $row['poster_id'], $row['forum_id']);
+		}
+		$this->db->sql_freeresult($result);
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	static public function get_step_count()
+	{
+		return 1;
+	}
+
+	/**
+	 * {@inheritdoc}
+	 */
+	public function get_task_lang_name()
+	{
+		return 'TASK_CREATE_SEARCH_INDEX';
+	}
+}
diff --git a/phpBB/phpbb/search/fulltext_native.php b/phpBB/phpbb/search/fulltext_native.php
index 2071a973e5..73dcfce9a5 100644
--- a/phpBB/phpbb/search/fulltext_native.php
+++ b/phpBB/phpbb/search/fulltext_native.php
@@ -120,7 +120,7 @@ class fulltext_native extends \phpbb\search\base
 		$this->phpbb_dispatcher = $phpbb_dispatcher;
 		$this->user = $user;
 
-		$this->word_length = array('min' => $this->config['fulltext_native_min_chars'], 'max' => $this->config['fulltext_native_max_chars']);
+		$this->word_length = array('min' => (int) $this->config['fulltext_native_min_chars'], 'max' => (int) $this->config['fulltext_native_max_chars']);
 
 		/**
 		* Load the UTF tools