[9.0] Fix p0=deprecation/10_basic/Test Deprecations (#125687)

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

@@ -16,11 +16,14 @@
 
 import java.io.IOException;
 import java.util.List;
+import java.util.Set;
 
 import static org.elasticsearch.rest.RestRequest.Method.GET;
 
 public class RestDeprecationInfoAction extends BaseRestHandler {
 
+ private static final Set<String> SUPPORTED_CAPABILITIES = Set.of("data_streams", "ilm_policies", "templates");
+
  @Override
  public List<Route> routes() {
  return List.of(new Route(GET, "/_migration/deprecations"), new Route(GET, "/{index}/_migration/deprecations"));
@@ -47,4 +50,9 @@ private static RestChannelConsumer handleGet(final RestRequest request, NodeClie
  );
  return channel -> client.execute(DeprecationInfoAction.INSTANCE, infoRequest, new RestToXContentListener<>(channel));
  }
+
+ @Override
+ public Set<String> supportedCapabilities() {
+ return SUPPORTED_CAPABILITIES;
+ }
 }

x-pack/plugin/src/yamlRestTest/resources/rest-api-spec/test/deprecation/10_basic.yml

@@ -11,9 +11,11 @@ setup:
  - method: GET
  path: /_migration/deprecations
  capabilities: [ data_streams, ilm_policies, templates ]
- test_runner_features: capabilities
+ test_runner_features: [capabilities, allowed_warnings]
  reason: "Support for data streams, ILM policies and templates"
  - do:
+ allowed_warnings:
+ - "this request accesses system indices: [.security-7], but in a future major version, direct access to system indices will be prevented by default"
  migration.deprecations:
  index: "*"
  - length: { cluster_settings: 0 }