Fix explain lifecycle REST API test failure
@@ -140,7 +140,7 @@ public class IndexLifecycleIT extends ESRestHighLevelClientTestCase {
" \"cold\": {\n" +
" \"after\": \"2000s\",\n" +
" \"actions\": {\n" +
- " \"replicas\": {\n" +
+ " \"allocate\": {\n" +
" \"number_of_replicas\": 0\n" +
" }\n" +
" }\n" +
