Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/block_content/config/install/core.entity_view_mode.block_content.full.yml

@@ -0,0 +1,8 @@
+id: block_content.full
+label: Full
+status: false
+cache: true
+targetEntityType: block_content
+dependencies:
+  module:
+    - block_content

core/modules/block_content/config/install/field.storage.block_content.body.yml

@@ -0,0 +1,17 @@
+langcode: en
+status: true
+dependencies:
+  module:
+    - block_content
+    - text
+id: block_content.body
+field_name: body
+entity_type: block_content
+type: text_with_summary
+settings: {  }
+module: text
+locked: false
+cardinality: 1
+translatable: true
+indexes: {  }
+persist_with_no_fields: true