fix test issue

test/framework/src/main/java/org/elasticsearch/test/rest/ESRestTestCase.java

@@ -1178,7 +1178,14 @@ protected static void wipeDataStreams() throws IOException {
                 // We hit a version of ES that doesn't serialize DeleteDataStreamAction.Request#wildcardExpressionsOriginallySpecified field
                 // or that doesn't support data streams so it's safe to ignore
                 int statusCode = ee.getResponse().getStatusLine().getStatusCode();
-                if (statusCode < 404 || statusCode > 405) {
+                if (statusCode == 400) {
+                    // the test cluster likely does not include the data streams module so we can ignore this error code
+                    // additionally there is an implementation gotcha that cause response code to be 400 or 405 dependent on if
+                    // "_data_stream/*" matches a registered index pattern such as {a}/{b} but not for the HTTP verb.
+                    // Prior to v9 POST {index}/{type} was registered as a compatible index pattern so the request would partially match
+                    // and return a 405, but without that pattern registered at all the return value is a 400.
+                    return;
+                } else if (statusCode < 404 || statusCode > 405) {
                     throw ee;
                 }
             }