[8.2] Add 'if_version' parameter to 'ingest.put_pipeline' API

Co-authored-by: Seth Michael Larson <[email protected]>

Author: github-actions[bot]

output/schema/schema.json

@@ -44,6 +44,10 @@ export interface Request extends RequestBase {
      * Period to wait for a response. If no response is received before the timeout expires, the request fails and returns an error.
      * @server_default 30s */
     timeout?: Time
+    /**
+     * Required version for optimistic concurrency control for pipeline updates
+     */
+    if_version?: VersionNumber
   }
   body: {
     /**