Add availability information

Author: carlosdelest

output/openapi/elasticsearch-serverless-openapi.json

@@ -50,6 +50,7 @@ export interface Request extends RequestBase {
      * If `true`, the request will refresh the analyzers with the deleted synonym rule and wait for the new synonyms to be available before returning.
      * If `false`, analyzers will not be reloaded with the deleted synonym rule
      * @server_default true
+     * @availability stack since=9.1.0
      */
     refresh?: boolean
   }

output/schema/schema-serverless.json

@@ -57,6 +57,7 @@ export interface Request extends RequestBase {
      * If `true`, the request will refresh the analyzers with the new synonyms set and wait for the new synonyms to be available before returning.
      * If `false`, analyzers will not be reloaded with the new synonym set
      * @server_default true
+     * @availability stack since=9.1.0
      */
     refresh?: boolean
   }

output/schema/schema.json

@@ -62,6 +62,7 @@ export interface Request extends RequestBase {
      * If `true`, the request will refresh the analyzers with the new synonym rule and wait for the new synonyms to be available before returning.
      * If `false`, analyzers will not be reloaded with the new synonym rule
      * @server_default true
+     * @availability stack since=9.1.0
      */
     refresh?: boolean
   }