ES-9508 Datafeed deprecated options notice

Author: lukewhiting

x-pack/plugin/deprecation/src/main/java/org/elasticsearch/xpack/deprecation/MlDeprecationChecker.java

@@ -39,7 +39,7 @@ static Optional<DeprecationIssue> checkDataFeedQuery(DatafeedConfig datafeedConf
                 new DeprecationIssue(
                     DeprecationIssue.Level.WARNING,
                     "Datafeed [" + datafeedConfig.getId() + "] uses deprecated query options",
-                    "https://www.elastic.co/guide/en/elasticsearch/reference/master/breaking-changes-7.0.html#breaking_70_search_changes",
+                    "https://ela.st/es-deprecation-7-data-feed-query",
                     deprecations.toString(),
                     false,
                     null