Use step constants in factory

Signed-off-by: kokibas <[email protected]>

Author: kokibas

src/main/java/org/opensearch/flowframework/workflow/WorkflowStepFactory.java

@@ -23,7 +23,6 @@
 import org.opensearch.threadpool.ThreadPool;
 import org.opensearch.transport.client.Client;
 
-import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
@@ -132,8 +131,8 @@ public enum WorkflowSteps {
         /** Create Index Step */
         CREATE_INDEX(
             CreateIndexStep.NAME,
-            new ArrayList<>(CreateIndexStep.REQUIRED_INPUTS),
-            new ArrayList<>(CreateIndexStep.PROVIDED_OUTPUTS),
+            CreateIndexStep.REQUIRED_INPUTS,
+            CreateIndexStep.PROVIDED_OUTPUTS,
             Collections.emptyList(),
             null
         ),
@@ -153,8 +152,8 @@ public enum WorkflowSteps {
         /** Create Connector Step */
         CREATE_CONNECTOR(
             CreateConnectorStep.NAME,
-            new ArrayList<>(CreateConnectorStep.REQUIRED_INPUTS),
-            new ArrayList<>(CreateConnectorStep.PROVIDED_OUTPUTS),
+            CreateConnectorStep.REQUIRED_INPUTS,
+            CreateConnectorStep.PROVIDED_OUTPUTS,
             List.of(OPENSEARCH_ML),
             TimeValue.timeValueSeconds(60)
         ),