Issue #2428297 by tvlooy: Duplicate index on entity_id column in dedicated field tables

core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorageSchema.php

@@ -1627,7 +1627,6 @@ protected function getDedicatedTableSchema(FieldStorageDefinitionInterface $stor
       'indexes' => array(
         'bundle' => array('bundle'),
         'deleted' => array('deleted'),
-        'entity_id' => array('entity_id'),
         'revision_id' => array('revision_id'),
         'langcode' => array('langcode'),
       ),

core/tests/Drupal/Tests/Core/Entity/Sql/SqlContentEntityStorageSchemaTest.php

@@ -863,7 +863,6 @@ public function testDedicatedTableSchema() {
         'indexes' => array(
           'bundle' => array('bundle'),
           'deleted' => array('deleted'),
-          'entity_id' => array('entity_id'),
           'revision_id' => array('revision_id'),
           'langcode' => array('langcode'),
         ),
@@ -1011,7 +1010,6 @@ public function testDedicatedTableSchemaForEntityWithStringIdentifier() {
         'indexes' => array(
           'bundle' => array('bundle'),
           'deleted' => array('deleted'),
-          'entity_id' => array('entity_id'),
           'revision_id' => array('revision_id'),
           'langcode' => array('langcode'),
         ),