Fix more tests

Author: jbaiera

modules/data-streams/build.gradle

@@ -72,4 +72,5 @@ tasks.named("yamlRestCompatTestTransform").configure({ task ->
   task.skipTest("data_stream/200_rollover_failure_store/Roll over a data stream's failure store with conditions", "Configuring the failure store via data stream templates is not supported anymore.")
 
   task.skipTest("data_stream/200_rollover_failure_store/Rolling over a failure store on a data stream without the failure store enabled should work", "Rolling over a data stream using target_failure_store is no longer supported.")
+  task.skipTest("data_stream/200_rollover_failure_store/Rolling over an uninitialized failure store should initialize it", "Rolling over a data stream using target_failure_store is no longer supported.")
 })

modules/data-streams/src/javaRestTest/java/org/elasticsearch/datastreams/DataStreamOptionsIT.java

@@ -57,7 +57,7 @@ public void setup() throws IOException {
 
         assertOK(client().performRequest(new Request("PUT", "/_data_stream/" + DATA_STREAM_NAME)));
         // Initialize the failure store.
-        assertOK(client().performRequest(new Request("POST", DATA_STREAM_NAME + "/_rollover?target_failure_store")));
+        assertOK(client().performRequest(new Request("POST", DATA_STREAM_NAME + "::failures/_rollover")));
         ensureGreen(DATA_STREAM_NAME);
 
         final Response dataStreamResponse = client().performRequest(new Request("GET", "/_data_stream/" + DATA_STREAM_NAME));