fixing TransportUpdateDataStreamMappingsActionIT

Author: masseyke

modules/data-streams/src/internalClusterTest/java/org/elasticsearch/datastreams/TransportUpdateDataStreamMappingsActionIT.java

@@ -57,8 +57,10 @@ public void testGetAndUpdateMappings() throws IOException {
         Map<String, Object> originalMappings = Map.of(
             "dynamic",
             "strict",
+            "_data_stream_timestamp",
+            Map.of("enabled", true),
             "properties",
-            Map.of("foo1", Map.of("type", "text"), "foo2", Map.of("type", "text"))
+            Map.of("@timestamp", Map.of("type", "date"), "foo1", Map.of("type", "text"), "foo2", Map.of("type", "text"))
         );
         Map<String, Object> mappingOverrides = Map.of(
             "properties",
@@ -67,8 +69,19 @@ public void testGetAndUpdateMappings() throws IOException {
         Map<String, Object> expectedEffectiveMappings = Map.of(
             "dynamic",
             "strict",
+            "_data_stream_timestamp",
+            Map.of("enabled", true),
             "properties",
-            Map.of("foo1", Map.of("type", "text"), "foo2", Map.of("type", "keyword"), "foo3", Map.of("type", "text"))
+            Map.of(
+                "@timestamp",
+                Map.of("type", "date"),
+                "foo1",
+                Map.of("type", "text"),
+                "foo2",
+                Map.of("type", "keyword"),
+                "foo3",
+                Map.of("type", "text")
+            )
         );
         assertExpectedMappings(dataStreamName, Map.of(), originalMappings);
         updateMappings(dataStreamName, mappingOverrides, expectedEffectiveMappings, true);