Fleet: Add new mappings for .fleet-actions signing (#93802)

* Fleet: Add new mappings for .fleet-actions signing

* Update docs/changelog/93802.yaml

* Update changelog area entry

Author: aleksmaus

docs/changelog/93802.yaml

@@ -0,0 +1,5 @@
+pr: 93802
+summary: "Fleet: Add new mappings for .fleet-actions signing"
+area: Security
+type: enhancement
+issues: []

x-pack/plugin/core/src/main/resources/fleet-actions.json

@@ -45,6 +45,16 @@
         },
         "user_id" : {
           "type": "keyword"
+        },
+        "signed" : {
+          "properties": {
+            "data" : {
+              "type": "binary"
+            },
+            "signature" : {
+              "type": "binary"
+            }
+          }
         }
       }
     }