Fix tests that check for deprecation message

plugins/repository-s3/src/test/resources/rest-api-spec/test/repository_s3/20_repository.yaml

@@ -5,8 +5,8 @@
         features: warnings
     - do:
         warnings:
-          - "[access_key] setting was deprecated in Elasticsearch and it will be removed in a future release! See the breaking changes lists in the documentation for details"
-          - "[secret_key] setting was deprecated in Elasticsearch and it will be removed in a future release! See the breaking changes lists in the documentation for details"
+          - "[access_key] setting was deprecated in Elasticsearch and will be removed in a future release! See the breaking changes documentation for the next major version."
+          - "[secret_key] setting was deprecated in Elasticsearch and will be removed in a future release! See the breaking changes documentation for the next major version."
         snapshot.create_repository:
           repository: test_repo_s3_1
           verify: false

rest-api-spec/src/main/resources/rest-api-spec/test/cat.shards/10_basic.yaml

@@ -186,8 +186,8 @@
             shadow_replicas: true
             shared_filesystem: false
       warnings:
-        - "[index.shadow_replicas] setting was deprecated in Elasticsearch and it will be removed in a future release! See the breaking changes lists in the documentation for details"
-        - "[index.shared_filesystem] setting was deprecated in Elasticsearch and it will be removed in a future release! See the breaking changes lists in the documentation for details"
+        - "[index.shadow_replicas] setting was deprecated in Elasticsearch and will be removed in a future release! See the breaking changes documentation for the next major version."
+        - "[index.shared_filesystem] setting was deprecated in Elasticsearch and will be removed in a future release! See the breaking changes documentation for the next major version."
 
   - do:
       cat.shards: