resolve code review comments

Signed-off-by: yuye-aws <[email protected]>

src/main/java/org/opensearch/neuralsearch/processor/DocumentChunkingProcessor.java

@@ -155,7 +155,7 @@ private List<String> chunkString(String content) {
                     + "]"
             );
         }
-        return chunker.chunk(content, chunkerParameters);
+        return result;
     }
 
     private List<String> chunkList(List<String> contentList) {