add postprocess function for batch inferernce jobArn

Signed-off-by: Yaliang Wu <[email protected]>

common/src/main/java/org/opensearch/ml/common/connector/functions/postprocess/BedrockBatchJobArnPostProcessFunction.java

@@ -10,19 +10,20 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 
 public class BedrockBatchJobArnPostProcessFunction extends ConnectorPostProcessFunction<List<Float>> {
 
     @Override
     public void validate(Object input) {
-        if (!(input instanceof List)) {
-            throw new IllegalArgumentException("Post process function input is not a List.");
+        if (!(input instanceof Map)) {
+            throw new IllegalArgumentException("Post process function input is not a Map.");
         }
 
-        List<?> outerList = (List<?>) input;
+        Map<String, String> jobInfo = (Map<String, String>) input;
 
-        if (!outerList.isEmpty() && !(((List<?>) input).get(0) instanceof Number)) {
-            throw new IllegalArgumentException("The embedding should be a non-empty List containing Float values.");
+        if (!(jobInfo.containsKey("jobArn"))) {
+            throw new IllegalArgumentException("Bedrock batch job arn missing.");
         }
     }