diff --git a/output/schema/validation-errors.json b/output/schema/validation-errors.json
index dcaccc00a5..24a0de39b5 100644
--- a/output/schema/validation-errors.json
+++ b/output/schema/validation-errors.json
@@ -77,6 +77,7 @@
         "Request: missing json spec query parameter 'help'",
         "Request: missing json spec query parameter 's'",
         "Request: missing json spec query parameter 'v'",
+        "Request: missing json spec query parameter 'master_timeout'",
         "request definition cat.aliases:Request / body - A request with inherited properties must have a PropertyBody"
       ],
       "response": []
@@ -708,12 +709,6 @@
       ],
       "response": []
     },
-    "indices.exists_alias": {
-      "request": [
-        "Request: query parameter 'master_timeout' does not exist in the json spec"
-      ],
-      "response": []
-    },
     "indices.exists_index_template": {
       "request": [
         "Request: missing json spec query parameter 'flat_settings'",
@@ -729,12 +724,6 @@
       ],
       "response": []
     },
-    "indices.get_alias": {
-      "request": [
-        "Request: query parameter 'master_timeout' does not exist in the json spec"
-      ],
-      "response": []
-    },
     "indices.put_settings": {
       "request": [
         "Request: missing json spec query parameter 'reopen'"
diff --git a/specification/_json_spec/cat.aliases.json b/specification/_json_spec/cat.aliases.json
index 4f8062d899..27e20cf4d8 100644
--- a/specification/_json_spec/cat.aliases.json
+++ b/specification/_json_spec/cat.aliases.json
@@ -55,6 +55,11 @@
         "options": ["open", "closed", "hidden", "none", "all"],
         "default": "all",
         "description": "Whether to expand wildcard expression to concrete indices that are open, closed or both."
+      },
+      "master_timeout": {
+        "type": "time",
+        "description": "Timeout for waiting for new cluster state in case it is blocked",
+        "default": "30s"
       }
     }
   }
diff --git a/specification/_json_spec/indices.exists_alias.json b/specification/_json_spec/indices.exists_alias.json
index bc000bc727..9ad4a93551 100644
--- a/specification/_json_spec/indices.exists_alias.json
+++ b/specification/_json_spec/indices.exists_alias.json
@@ -51,6 +51,11 @@
         "options": ["open", "closed", "hidden", "none", "all"],
         "default": "all",
         "description": "Whether to expand wildcard expression to concrete indices that are open, closed or both."
+      },
+      "master_timeout": {
+        "type": "time",
+        "description": "Timeout for waiting for new cluster state in case it is blocked",
+        "default": "30s"
       }
     }
   }
diff --git a/specification/_json_spec/indices.get_alias.json b/specification/_json_spec/indices.get_alias.json
index 419aa237d0..98b37607ea 100644
--- a/specification/_json_spec/indices.get_alias.json
+++ b/specification/_json_spec/indices.get_alias.json
@@ -65,6 +65,11 @@
         "options": ["open", "closed", "hidden", "none", "all"],
         "default": "all",
         "description": "Whether to expand wildcard expression to concrete indices that are open, closed or both."
+      },
+      "master_timeout": {
+        "type": "time",
+        "description": "Timeout for waiting for new cluster state in case it is blocked",
+        "default": "30s"
       }
     }
   }