Add failures

Author: pquentin

specification/_global/capabilities/CapabilitiesResponse.ts

@@ -17,13 +17,18 @@
  * under the License.
  */
 
-import { Name } from '@_types/common'
+import { Id, Name } from '@_types/common'
 import { NodeStatistics } from '@_types/Node'
 
 export class Response {
   body: {
     _nodes: NodeStatistics
     cluster_name: Name
     supported: boolean | null
+    failures?: FailedNodeException[]
   }
 }
+
+export class FailedNodeException {
+  node_id: Id
+}