Update rest-api-spec

Author: pquentin

output/openapi/elasticsearch-openapi.json

@@ -63,12 +63,13 @@
     },
     "params": {
       "local": {
+        "deprecated": true,
         "type": "boolean",
         "description": "Return local information, do not retrieve the state from master node (default: false)"
       },
       "master_timeout": {
         "type": "time",
-        "description": "Specify timeout for connection to master"
+        "description": "Timeout for waiting for new cluster state in case it is blocked"
       },
       "flat_settings": {
         "type": "boolean",