Update rest-api-spec/src/main/resources/rest-api-spec/api/cat.segments.json

Co-authored-by: Copilot <[email protected]>

Author: lukewhiting

rest-api-spec/src/main/resources/rest-api-spec/api/cat.segments.json

@@ -101,7 +101,7 @@
           "none",
           "all"
         ],
-        "default": "all",
+        "default": "open",
         "description": "Whether to expand wildcard expression to concrete indices that are open, closed or both."
       },
       "allow_closed": {