Issue #3428693: Update to v26.0

Closes #3428693

src/SchemaDotOrgInstaller.php

@@ -392,6 +392,7 @@ class SchemaDotOrgInstaller implements SchemaDotOrgInstallerInterface {
       'primary key' => ['id'],
       'indexes' => [
         'label' => ['label'],
+        'enumerationtype' => ['enumerationtype'],
       ],
     ];
     // Schema.org: Properties.