[SPEC] Remove duplicated timeout param from bulk REST spec

Closes #10205

rest-api-spec/api/bulk.json

@@ -36,10 +36,6 @@
         "type": {
           "type" : "string",
           "description" : "Default document type for items which don't provide one"
-        },
-        "timeout": {
-          "type" : "time",
-          "description" : "Explicit operation timeout"
         }
       }
     },