ignore all exceptions from ILM cleanup in RestTestCase

Author: talevy

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

@@ -534,12 +534,8 @@ private static void deleteAllPolicies() throws IOException {
             Response response = adminClient().performRequest(new Request("GET", "/_ilm/policy"));
             policies = entityAsMap(response);
         } catch (ResponseException e) {
-            int statusCode = e.getResponse().getStatusLine().getStatusCode();
-            if (RestStatus.METHOD_NOT_ALLOWED.getStatus() == statusCode || RestStatus.BAD_REQUEST.getStatus() == statusCode) {
-                // If bad request returned, ILM is not enabled.
-                return;
-            }
-            throw e;
+            // If bad request returned, ILM is not enabled.
+            return;
         }
 
         if (policies == null || policies.isEmpty()) {