Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

core/modules/file/migration_templates/d6_file.yml

@@ -1,7 +1,7 @@
 # Every migration that saves into {file_managed} must have the d6_file
 # migration as an optional dependency to ensure d6_file runs first.
 id: d6_file
-label: Drupal 6 files
+label: Files
 migration_tags:
   - Drupal 6
 source:

core/modules/file/migration_templates/d6_file_settings.yml

@@ -1,5 +1,5 @@
 id: d6_file_settings
-label: Drupal 6 file configuration
+label: File configuration
 migration_tags:
   - Drupal 6
 source:

core/modules/file/migration_templates/d6_upload.yml

@@ -1,5 +1,5 @@
 id: d6_upload
-label: Drupal 6 file uploads
+label: File uploads
 migration_tags:
   - Drupal 6
 source:

core/modules/file/migration_templates/d6_upload_entity_display.yml

@@ -1,5 +1,5 @@
 id: d6_upload_entity_display
-label: Drupal 6 upload display configuration
+label: Upload display configuration
 migration_tags:
   - Drupal 6
 source:
@@ -19,7 +19,7 @@ process:
   field_name: 'constants/name'
   type: 'constants/type'
   options: 'constants/options'
-  'options/type': @type
+  'options/type': '@type'
 destination:
   plugin: component_entity_display
 migration_dependencies:

core/modules/file/migration_templates/d6_upload_entity_form_display.yml

@@ -1,5 +1,5 @@
 id: d6_upload_entity_form_display
-label: Drupal 6 upload form display configuration
+label: Upload form display configuration
 migration_tags:
   - Drupal 6
 source:
@@ -20,7 +20,7 @@ process:
   form_mode: 'constants/form_mode'
   type: 'constants/type'
   options: 'constants/options'
-  'options/type': @type
+  'options/type': '@type'
 destination:
   plugin: component_entity_form_display
 migration_dependencies:

core/modules/file/migration_templates/d6_upload_field.yml

@@ -1,5 +1,5 @@
 id: d6_upload_field
-label: Drupal 6 upload field configuration
+label: Upload field configuration
 migration_tags:
   - Drupal 6
 source:

core/modules/file/migration_templates/d6_upload_field_instance.yml

@@ -1,5 +1,5 @@
 id: d6_upload_field_instance
-label: Drupal 6 upload field instance configuration
+label: Upload field instance configuration
 migration_tags:
   - Drupal 6
 source:

core/modules/file/migration_templates/d7_file.yml

@@ -1,7 +1,7 @@
 # Every migration that references a file by fid should specify this migration
 # as an optional dependency.
 id: d7_file
-label: Drupal 7 files
+label: Files
 migration_tags:
   - Drupal 7
 source: