Add JSON schema and contrib

Author: smalyshev

output/openapi/elasticsearch-openapi.json

@@ -39,6 +39,12 @@
         "type": "boolean",
         "description": "Whether to ignore if a wildcard indices expression resolves into no concrete indices. (This includes `_all` string or when no indices have been specified)",
         "default": true
+      },
+      "mode": {
+        "type": "enum",
+        "options": ["standard", "time_series", "logsdb", "lookup"],
+        "default": "",
+        "description": "Filter indices by index mode. Comma-separated list of IndexMode. Empty means no filter."
       }
     }
   }

output/openapi/elasticsearch-serverless-openapi.json

@@ -66,7 +66,7 @@ export interface Request extends RequestBase {
      */
     allow_no_indices?: boolean
     /**
-     * Filter by index mode - standard, lookup, time_series, etc. Comma-separated list of IndexMode. Empty means no filter.
+     * Filter indices by index mode - standard, lookup, time_series, etc. Comma-separated list of IndexMode. Empty means no filter.
      */
     mode?: IndexMode | IndexMode[]
   }