diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Schema.php b/core/lib/Drupal/Core/Database/Driver/mysql/Schema.php
index f3cc3ff..c66330f 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Schema.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Schema.php
@@ -500,8 +500,6 @@ public function addIndex($table, $name, $fields, array $spec) {
     $spec['indexes'][$name] = $fields;
     $indexes = $this->getNormalizedIndexes($spec);
 
-    $this->validateIndex($table, $name);
-
     $this->connection->query('ALTER TABLE {' . $table . '} ADD INDEX `' . $name . '` (' . $this->createKeySql($indexes[$name]) . ')');
   }
 
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php
index 221e5bf..fc46542 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php
@@ -649,7 +649,6 @@ public function addIndex($table, $name, $fields, array $spec) {
     }
 
     $spec['indexes'][$name] = $fields;
-    $this->validateIndex($table, $name);
 
     $this->connection->query($this->_createIndexSql($table, $name, $fields));
     $this->resetTableInformation($table);
diff --git a/core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php b/core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php
index 9ef0750..cf19c48 100644
--- a/core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php
+++ b/core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php
@@ -594,7 +594,6 @@ public function addIndex($table, $name, $fields, array $spec) {
     }
 
     $spec['indexes'][$name] = $fields;
-    $this->validateIndex($table, $name);
 
     $statements = $this->createIndexSql($table, $spec);
     foreach ($statements as $statement) {