diff --git a/RFS/src/main/java/org/opensearch/migrations/bulkload/common/InvalidResponse.java b/RFS/src/main/java/org/opensearch/migrations/bulkload/common/InvalidResponse.java
index 21f55415b..d940ca5d8 100644
--- a/RFS/src/main/java/org/opensearch/migrations/bulkload/common/InvalidResponse.java
+++ b/RFS/src/main/java/org/opensearch/migrations/bulkload/common/InvalidResponse.java
@@ -17,7 +17,7 @@
 
 @Slf4j
 public class InvalidResponse extends RfsException {
-    private static final Pattern unknownSetting = Pattern.compile("unknown setting \\[(.+)\\].+");
+    private static final Pattern unknownSetting = Pattern.compile("unknown setting \\[(.+?)\\].+");
     private static final ObjectMapper objectMapper = new ObjectMapper();
     private final HttpResponse response;