diff --git a/src/main/java/org/opensearch/ad/indices/AnomalyDetectionIndices.java b/src/main/java/org/opensearch/ad/indices/AnomalyDetectionIndices.java
index 50e16b652..0d44c056b 100644
--- a/src/main/java/org/opensearch/ad/indices/AnomalyDetectionIndices.java
+++ b/src/main/java/org/opensearch/ad/indices/AnomalyDetectionIndices.java
@@ -1153,7 +1153,7 @@ private void updateJobIndexSettingIfNecessary(IndexState jobIndexState, ActionLi
 
     private static Integer getIntegerSetting(GetSettingsResponse settingsResponse, String settingKey) {
         Integer value = null;
-        Iterator<Settings> iter = settingsResponse.getIndexToSettings().valuesIt();
+        Iterator<Settings> iter = settingsResponse.getIndexToSettings().values().iterator();
         while (iter.hasNext()) {
             Settings settings = iter.next();
             value = settings.getAsInt(settingKey, null);
@@ -1166,7 +1166,7 @@ private static Integer getIntegerSetting(GetSettingsResponse settingsResponse, S
 
     private static String getStringSetting(GetSettingsResponse settingsResponse, String settingKey) {
         String value = null;
-        Iterator<Settings> iter = settingsResponse.getIndexToSettings().valuesIt();
+        Iterator<Settings> iter = settingsResponse.getIndexToSettings().values().iterator();
         while (iter.hasNext()) {
             Settings settings = iter.next();
             value = settings.get(settingKey, null);
diff --git a/src/test/java/org/opensearch/ad/ADIntegTestCase.java b/src/test/java/org/opensearch/ad/ADIntegTestCase.java
index 66d8fabf5..a1dfe0320 100644
--- a/src/test/java/org/opensearch/ad/ADIntegTestCase.java
+++ b/src/test/java/org/opensearch/ad/ADIntegTestCase.java
@@ -53,7 +53,6 @@
 import org.opensearch.client.node.NodeClient;
 import org.opensearch.cluster.node.DiscoveryNode;
 import org.opensearch.cluster.node.DiscoveryNodes;
-import org.opensearch.common.collect.ImmutableOpenMap;
 import org.opensearch.core.xcontent.ToXContent;
 import org.opensearch.core.xcontent.XContentBuilder;
 import org.opensearch.index.query.MatchAllQueryBuilder;
@@ -65,7 +64,6 @@
 import org.opensearch.test.OpenSearchIntegTestCase;
 import org.opensearch.test.transport.MockTransportService;
 
-import com.carrotsearch.hppc.cursors.ObjectObjectCursor;
 import com.google.common.collect.ImmutableMap;
 
 public abstract class ADIntegTestCase extends OpenSearchIntegTestCase {
@@ -252,7 +250,7 @@ public ClusterUpdateSettingsResponse updateTransientSettings(Map<String, ?> sett
         return clusterAdmin().updateSettings(updateSettingsRequest).actionGet(timeout);
     }
 
-    public ImmutableOpenMap<String, DiscoveryNode> getDataNodes() {
+    public Map<String, DiscoveryNode> getDataNodes() {
         DiscoveryNodes nodes = clusterService().state().getNodes();
         return nodes.getDataNodes();
     }
@@ -268,10 +266,10 @@ public Client getDataNodeClient() {
 
     public DiscoveryNode[] getDataNodesArray() {
         DiscoveryNodes nodes = clusterService().state().getNodes();
-        Iterator<ObjectObjectCursor<String, DiscoveryNode>> iterator = nodes.getDataNodes().iterator();
+        Iterator<DiscoveryNode> iterator = nodes.getDataNodes().values().iterator();
         List<DiscoveryNode> dataNodes = new ArrayList<>();
         while (iterator.hasNext()) {
-            dataNodes.add(iterator.next().value);
+            dataNodes.add(iterator.next());
         }
         return dataNodes.toArray(new DiscoveryNode[0]);
     }
diff --git a/src/test/java/test/org/opensearch/ad/util/ClusterCreation.java b/src/test/java/test/org/opensearch/ad/util/ClusterCreation.java
index 2061e42fc..c4af50118 100644
--- a/src/test/java/test/org/opensearch/ad/util/ClusterCreation.java
+++ b/src/test/java/test/org/opensearch/ad/util/ClusterCreation.java
@@ -18,7 +18,9 @@
 import java.net.InetAddress;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
 
 import org.opensearch.Version;
 import org.opensearch.cluster.ClusterName;
@@ -26,7 +28,6 @@
 import org.opensearch.cluster.metadata.Metadata;
 import org.opensearch.cluster.node.DiscoveryNode;
 import org.opensearch.cluster.node.DiscoveryNodes;
-import org.opensearch.common.collect.ImmutableOpenMap;
 import org.opensearch.common.transport.TransportAddress;
 
 public class ClusterCreation {
@@ -66,12 +67,12 @@ public static ClusterState state(
      *
      * TODO: ModelManagerTests has the same method.  Refactor.
      */
-    public static ImmutableOpenMap<String, DiscoveryNode> createDataNodes(int numDataNodes) {
-        ImmutableOpenMap.Builder<String, DiscoveryNode> dataNodes = ImmutableOpenMap.builder();
+    public static Map<String, DiscoveryNode> createDataNodes(int numDataNodes) {
+        final Map<String, DiscoveryNode> dataNodes = new HashMap<>();
         for (int i = 0; i < numDataNodes; i++) {
             dataNodes.put("foo" + i, mock(DiscoveryNode.class));
         }
-        return dataNodes.build();
+        return dataNodes;
     }
 
     /**