diff --git a/core/src/main/resources/org/elasticsearch/tasks/task-index-mapping.json b/core/src/main/resources/org/elasticsearch/tasks/task-index-mapping.json
index 262519fd381..4863cdb539b 100644
--- a/core/src/main/resources/org/elasticsearch/tasks/task-index-mapping.json
+++ b/core/src/main/resources/org/elasticsearch/tasks/task-index-mapping.json
@@ -2,6 +2,9 @@
   "task" : {
     "dynamic" : "strict",
     "properties" : {
+      "completed": {
+        "type": "boolean"
+      },
       "task" : {
         "properties": {
           "action": {