diff --git a/libraries/src/Language/LanguageStemmer.php b/libraries/src/Language/LanguageStemmer.php
deleted file mode 100644
index c2d5a869d5cfb..0000000000000
--- a/libraries/src/Language/LanguageStemmer.php
+++ /dev/null
@@ -1,78 +0,0 @@
-<?php
-/**
- * Joomla! Content Management System
- *
- * @copyright  Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved.
- * @license    GNU General Public License version 2 or later; see LICENSE.txt
- */
-
-namespace Joomla\CMS\Language;
-
-defined('JPATH_PLATFORM') or die;
-
-/**
- * Stemmer base class.
- *
- * @since  3.0.0
- */
-abstract class LanguageStemmer
-{
-	/**
-	 * An internal cache of stemmed tokens.
-	 *
-	 * @var    array
-	 * @since  3.0.0
-	 */
-	protected $cache = array();
-
-	/**
-	 * @var    array  LanguageStemmer instances.
-	 * @since  3.0.0
-	 */
-	protected static $instances = array();
-
-	/**
-	 * Method to get a stemmer, creating it if necessary.
-	 *
-	 * @param   string  $adapter  The type of stemmer to load.
-	 *
-	 * @return  LanguageStemmer  A LanguageStemmer instance.
-	 *
-	 * @since   3.0.0
-	 * @throws  \RuntimeException on invalid stemmer.
-	 */
-	public static function getInstance($adapter)
-	{
-		// Only create one stemmer for each adapter.
-		if (isset(self::$instances[$adapter]))
-		{
-			return self::$instances[$adapter];
-		}
-
-		// Setup the adapter for the stemmer.
-		$class = 'Joomla\\CMS\\Language\\Stemmer\\' . ucfirst(trim($adapter));
-
-		// Check if a stemmer exists for the adapter.
-		if (!class_exists($class))
-		{
-			// Throw invalid adapter exception.
-			throw new \RuntimeException(Text::sprintf('JLIB_STEMMER_INVALID_STEMMER', $adapter));
-		}
-
-		self::$instances[$adapter] = new $class;
-
-		return self::$instances[$adapter];
-	}
-
-	/**
-	 * Method to stem a token and return the root.
-	 *
-	 * @param   string  $token  The token to stem.
-	 * @param   string  $lang   The language of the token.
-	 *
-	 * @return  string  The root token.
-	 *
-	 * @since   3.0.0
-	 */
-	abstract public function stem($token, $lang);
-}
diff --git a/libraries/src/Language/Stemmer/Porteren.php b/libraries/src/Language/Stemmer/Porteren.php
deleted file mode 100644
index 6ccd3b7c85445..0000000000000
--- a/libraries/src/Language/Stemmer/Porteren.php
+++ /dev/null
@@ -1,452 +0,0 @@
-<?php
-/**
- * Joomla! Content Management System
- *
- * @copyright  Copyright (C) 2005 - 2019 Open Source Matters, Inc. All rights reserved.
- * @copyright  Copyright (C) 2005 Richard Heyes (http://www.phpguru.org/). All rights reserved.
- * @license    GNU General Public License version 2 or later; see LICENSE.txt
- */
-
-namespace Joomla\CMS\Language\Stemmer;
-
-defined('JPATH_PLATFORM') or die;
-
-use Joomla\CMS\Language\LanguageStemmer;
-
-/**
- * Porter English stemmer class.
- *
- * This class was adapted from one written by Richard Heyes.
- * See copyright and link information above.
- *
- * @since  3.0.0
- */
-class Porteren extends LanguageStemmer
-{
-	/**
-	 * Regex for matching a consonant.
-	 *
-	 * @var    string
-	 * @since  3.0.0
-	 */
-	private static $_regex_consonant = '(?:[bcdfghjklmnpqrstvwxz]|(?<=[aeiou])y|^y)';
-
-	/**
-	 * Regex for matching a vowel
-	 * @var    string
-	 * @since  3.0.0
-	 */
-	private static $_regex_vowel = '(?:[aeiou]|(?<![aeiou])y)';
-
-	/**
-	 * Method to stem a token and return the root.
-	 *
-	 * @param   string  $token  The token to stem.
-	 * @param   string  $lang   The language of the token.
-	 *
-	 * @return  string  The root token.
-	 *
-	 * @since   3.0.0
-	 */
-	public function stem($token, $lang)
-	{
-		// Check if the token is long enough to merit stemming.
-		if (strlen($token) <= 2)
-		{
-			return $token;
-		}
-
-		// Check if the language is English or All.
-		if ($lang !== 'en')
-		{
-			return $token;
-		}
-
-		// Stem the token if it is not in the cache.
-		if (!isset($this->cache[$lang][$token]))
-		{
-			// Stem the token.
-			$result = $token;
-			$result = self::_step1ab($result);
-			$result = self::_step1c($result);
-			$result = self::_step2($result);
-			$result = self::_step3($result);
-			$result = self::_step4($result);
-			$result = self::_step5($result);
-
-			// Add the token to the cache.
-			$this->cache[$lang][$token] = $result;
-		}
-
-		return $this->cache[$lang][$token];
-	}
-
-	/**
-	 * Step 1
-	 *
-	 * @param   string  $word  The token to stem.
-	 *
-	 * @return  string
-	 *
-	 * @since   3.0.0
-	 */
-	private static function _step1ab($word)
-	{
-		// Part a
-		if (substr($word, -1) == 's')
-		{
-				self::_replace($word, 'sses', 'ss')
-			|| self::_replace($word, 'ies', 'i')
-			|| self::_replace($word, 'ss', 'ss')
-			|| self::_replace($word, 's', '');
-		}
-
-		// Part b
-		if (substr($word, -2, 1) != 'e' || !self::_replace($word, 'eed', 'ee', 0))
-		{
-			// First rule
-			$v = self::$_regex_vowel;
-
-			// Check ing and ed
-			// Note use of && and OR, for precedence reasons
-			if (preg_match("#$v+#", substr($word, 0, -3)) && self::_replace($word, 'ing', '')
-				|| preg_match("#$v+#", substr($word, 0, -2)) && self::_replace($word, 'ed', ''))
-			{
-				// If one of above two test successful
-				if (!self::_replace($word, 'at', 'ate') && !self::_replace($word, 'bl', 'ble') && !self::_replace($word, 'iz', 'ize'))
-				{
-					// Double consonant ending
-					if (self::_doubleConsonant($word) && substr($word, -2) != 'll' && substr($word, -2) != 'ss' && substr($word, -2) != 'zz')
-					{
-						$word = substr($word, 0, -1);
-					}
-					elseif (self::_m($word) == 1 && self::_cvc($word))
-					{
-						$word .= 'e';
-					}
-				}
-			}
-		}
-
-		return $word;
-	}
-
-	/**
-	 * Step 1c
-	 *
-	 * @param   string  $word  The token to stem.
-	 *
-	 * @return  string
-	 *
-	 * @since   3.0.0
-	 */
-	private static function _step1c($word)
-	{
-		$v = self::$_regex_vowel;
-
-		if (substr($word, -1) == 'y' && preg_match("#$v+#", substr($word, 0, -1)))
-		{
-			self::_replace($word, 'y', 'i');
-		}
-
-		return $word;
-	}
-
-	/**
-	 * Step 2
-	 *
-	 * @param   string  $word  The token to stem.
-	 *
-	 * @return  string
-	 *
-	 * @since   3.0.0
-	 */
-	private static function _step2($word)
-	{
-		switch (substr($word, -2, 1))
-		{
-			case 'a':
-					self::_replace($word, 'ational', 'ate', 0)
-				|| self::_replace($word, 'tional', 'tion', 0);
-				break;
-			case 'c':
-					self::_replace($word, 'enci', 'ence', 0)
-				|| self::_replace($word, 'anci', 'ance', 0);
-				break;
-			case 'e':
-				self::_replace($word, 'izer', 'ize', 0);
-				break;
-			case 'g':
-				self::_replace($word, 'logi', 'log', 0);
-				break;
-			case 'l':
-					self::_replace($word, 'entli', 'ent', 0)
-				|| self::_replace($word, 'ousli', 'ous', 0)
-				|| self::_replace($word, 'alli', 'al', 0)
-				|| self::_replace($word, 'bli', 'ble', 0)
-				|| self::_replace($word, 'eli', 'e', 0);
-				break;
-			case 'o':
-					self::_replace($word, 'ization', 'ize', 0)
-				|| self::_replace($word, 'ation', 'ate', 0)
-				|| self::_replace($word, 'ator', 'ate', 0);
-				break;
-			case 's':
-					self::_replace($word, 'iveness', 'ive', 0)
-				|| self::_replace($word, 'fulness', 'ful', 0)
-				|| self::_replace($word, 'ousness', 'ous', 0)
-				|| self::_replace($word, 'alism', 'al', 0);
-				break;
-			case 't':
-					self::_replace($word, 'biliti', 'ble', 0)
-				|| self::_replace($word, 'aliti', 'al', 0)
-				|| self::_replace($word, 'iviti', 'ive', 0);
-				break;
-		}
-
-		return $word;
-	}
-
-	/**
-	 * Step 3
-	 *
-	 * @param   string  $word  The token to stem.
-	 *
-	 * @return  string
-	 *
-	 * @since   3.0.0
-	 */
-	private static function _step3($word)
-	{
-		switch (substr($word, -2, 1))
-		{
-			case 'a':
-				self::_replace($word, 'ical', 'ic', 0);
-				break;
-			case 's':
-				self::_replace($word, 'ness', '', 0);
-				break;
-			case 't':
-					self::_replace($word, 'icate', 'ic', 0)
-				|| self::_replace($word, 'iciti', 'ic', 0);
-				break;
-			case 'u':
-				self::_replace($word, 'ful', '', 0);
-				break;
-			case 'v':
-				self::_replace($word, 'ative', '', 0);
-				break;
-			case 'z':
-				self::_replace($word, 'alize', 'al', 0);
-				break;
-		}
-
-		return $word;
-	}
-
-	/**
-	 * Step 4
-	 *
-	 * @param   string  $word  The token to stem.
-	 *
-	 * @return  string
-	 *
-	 * @since   3.0.0
-	 */
-	private static function _step4($word)
-	{
-		switch (substr($word, -2, 1))
-		{
-			case 'a':
-				self::_replace($word, 'al', '', 1);
-				break;
-			case 'c':
-					self::_replace($word, 'ance', '', 1)
-				|| self::_replace($word, 'ence', '', 1);
-				break;
-			case 'e':
-				self::_replace($word, 'er', '', 1);
-				break;
-			case 'i':
-				self::_replace($word, 'ic', '', 1);
-				break;
-			case 'l':
-					self::_replace($word, 'able', '', 1)
-				|| self::_replace($word, 'ible', '', 1);
-				break;
-			case 'n':
-					self::_replace($word, 'ant', '', 1)
-				|| self::_replace($word, 'ement', '', 1)
-				|| self::_replace($word, 'ment', '', 1)
-				|| self::_replace($word, 'ent', '', 1);
-				break;
-			case 'o':
-				if (substr($word, -4) == 'tion' || substr($word, -4) == 'sion')
-				{
-					self::_replace($word, 'ion', '', 1);
-				}
-				else
-				{
-					self::_replace($word, 'ou', '', 1);
-				}
-				break;
-			case 's':
-				self::_replace($word, 'ism', '', 1);
-				break;
-			case 't':
-					self::_replace($word, 'ate', '', 1)
-				|| self::_replace($word, 'iti', '', 1);
-				break;
-			case 'u':
-				self::_replace($word, 'ous', '', 1);
-				break;
-			case 'v':
-				self::_replace($word, 'ive', '', 1);
-				break;
-			case 'z':
-				self::_replace($word, 'ize', '', 1);
-				break;
-		}
-
-		return $word;
-	}
-
-	/**
-	 * Step 5
-	 *
-	 * @param   string  $word  The token to stem.
-	 *
-	 * @return  string
-	 *
-	 * @since   3.0.0
-	 */
-	private static function _step5($word)
-	{
-		// Part a
-		if (substr($word, -1) == 'e')
-		{
-			if (self::_m(substr($word, 0, -1)) > 1)
-			{
-				self::_replace($word, 'e', '');
-			}
-			elseif (self::_m(substr($word, 0, -1)) == 1)
-			{
-				if (!self::_cvc(substr($word, 0, -1)))
-				{
-					self::_replace($word, 'e', '');
-				}
-			}
-		}
-
-		// Part b
-		if (self::_m($word) > 1 && self::_doubleConsonant($word) && substr($word, -1) == 'l')
-		{
-			$word = substr($word, 0, -1);
-		}
-
-		return $word;
-	}
-
-	/**
-	 * Replaces the first string with the second, at the end of the string. If third
-	 * arg is given, then the preceding string must match that m count at least.
-	 *
-	 * @param   string   &$str   String to check
-	 * @param   string   $check  Ending to check for
-	 * @param   string   $repl   Replacement string
-	 * @param   integer  $m      Optional minimum number of m() to meet
-	 *
-	 * @return  boolean  Whether the $check string was at the end
-	 *                   of the $str string. True does not necessarily mean
-	 *                   that it was replaced.
-	 *
-	 * @since   3.0.0
-	 */
-	private static function _replace(&$str, $check, $repl, $m = null)
-	{
-		$len = 0 - strlen($check);
-
-		if (substr($str, $len) == $check)
-		{
-			$substr = substr($str, 0, $len);
-
-			if (is_null($m) || self::_m($substr) > $m)
-			{
-				$str = $substr . $repl;
-			}
-
-			return true;
-		}
-
-		return false;
-	}
-
-	/**
-	 * m() measures the number of consonant sequences in $str. if c is
-	 * a consonant sequence and v a vowel sequence, and <..> indicates arbitrary
-	 * presence,
-	 *
-	 * <c><v>       gives 0
-	 * <c>vc<v>     gives 1
-	 * <c>vcvc<v>   gives 2
-	 * <c>vcvcvc<v> gives 3
-	 *
-	 * @param   string  $str  The string to return the m count for
-	 *
-	 * @return  integer  The m count
-	 *
-	 * @since   3.0.0
-	 */
-	private static function _m($str)
-	{
-		$c = self::$_regex_consonant;
-		$v = self::$_regex_vowel;
-
-		$str = preg_replace("#^$c+#", '', $str);
-		$str = preg_replace("#$v+$#", '', $str);
-
-		preg_match_all("#($v+$c+)#", $str, $matches);
-
-		return count($matches[1]);
-	}
-
-	/**
-	 * Returns true/false as to whether the given string contains two
-	 * of the same consonant next to each other at the end of the string.
-	 *
-	 * @param   string  $str  String to check
-	 *
-	 * @return  boolean  Result
-	 *
-	 * @since   3.0.0
-	 */
-	private static function _doubleConsonant($str)
-	{
-		$c = self::$_regex_consonant;
-
-		return preg_match("#$c{2}$#", $str, $matches) && $matches[0]{0} == $matches[0]{1};
-	}
-
-	/**
-	 * Checks for ending CVC sequence where second C is not W, X or Y
-	 *
-	 * @param   string  $str  String to check
-	 *
-	 * @return  boolean  Result
-	 *
-	 * @since   3.0.0
-	 */
-	private static function _cvc($str)
-	{
-		$c = self::$_regex_consonant;
-		$v = self::$_regex_vowel;
-
-		$result = preg_match("#($c$v$c)$#", $str, $matches)
-			&& strlen($matches[1]) == 3
-			&& $matches[1]{2} != 'w'
-			&& $matches[1]{2} != 'x'
-			&& $matches[1]{2} != 'y';
-
-		return $result;
-	}
-}