diff --git a/build.gradle b/build.gradle
index 336ceab5..22060d4c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -15,7 +15,7 @@
 
 buildscript {
     ext {
-        es_mv = '7.1'
+        es_mv = '7.2'
         es_group = "org.elasticsearch"
         es_version = '7.2.1'
         es_distribution = 'oss-zip'
@@ -311,6 +311,8 @@ dependencies {
     checkstyle "com.puppycrawl.tools:checkstyle:${project.checkstyle.toolVersion}"
 }
 
+compileJava.options.compilerArgs << "-Xlint:-deprecation,-rawtypes,-serial,-try,-unchecked"
+
 apply plugin: 'nebula.ospackage'
 
 // This is afterEvaluate because the bundlePlugin ZIP task is updated afterEvaluate and changes the ZIP name to match the plugin name
diff --git a/src/main/java/com/amazon/opendistroforelasticsearch/ad/AnomalyDetectorPlugin.java b/src/main/java/com/amazon/opendistroforelasticsearch/ad/AnomalyDetectorPlugin.java
index 843b7d82..0f2b4457 100644
--- a/src/main/java/com/amazon/opendistroforelasticsearch/ad/AnomalyDetectorPlugin.java
+++ b/src/main/java/com/amazon/opendistroforelasticsearch/ad/AnomalyDetectorPlugin.java
@@ -19,10 +19,8 @@
 import com.amazon.opendistroforelasticsearch.ad.cluster.ADClusterEventListener;
 import com.amazon.opendistroforelasticsearch.ad.cluster.ADMetaData;
 import com.amazon.opendistroforelasticsearch.ad.cluster.ADMetaData.ADMetaDataDiff;
-import com.amazon.opendistroforelasticsearch.ad.cluster.DailyCron;
 import com.amazon.opendistroforelasticsearch.ad.cluster.DeleteDetector;
 import com.amazon.opendistroforelasticsearch.ad.cluster.HashRing;
-import com.amazon.opendistroforelasticsearch.ad.cluster.HourlyCron;
 import com.amazon.opendistroforelasticsearch.ad.cluster.MasterEventListener;
 import com.amazon.opendistroforelasticsearch.ad.constant.CommonName;
 import com.amazon.opendistroforelasticsearch.ad.dataprocessor.Interpolator;
@@ -202,7 +200,7 @@ public Collection<Object> createComponents(
         NamedWriteableRegistry namedWriteableRegistry
     ) {
         Settings settings = environment.settings();
-        ClientUtil clientUtil = new ClientUtil(settings);
+        ClientUtil clientUtil = new ClientUtil(settings, client);
         IndexUtils indexUtils = new IndexUtils(client, clientUtil, clusterService);
         anomalyDetectionIndices = new AnomalyDetectionIndices(client, clusterService, threadPool, settings, clientUtil);
         this.clusterService = clusterService;
@@ -267,8 +265,6 @@ public Collection<Object> createComponents(
         anomalyDetectorRunner = new AnomalyDetectorRunner(modelManager, featureManager);
 
         DeleteDetector deleteUtil = new DeleteDetector(clusterService, clock);
-        DailyCron dailyCron = new DailyCron(deleteUtil, clock, client, AnomalyDetectorSettings.CHECKPOINT_TTL);
-        HourlyCron hourlyCron = new HourlyCron(clusterService, client);
 
         Map<String, ADStat<?>> stats = ImmutableMap
             .<String, ADStat<?>>builder()
@@ -313,11 +309,9 @@ public Collection<Object> createComponents(
                 runner,
                 new ADClusterEventListener(clusterService, hashRing, modelManager),
                 deleteUtil,
-                dailyCron,
-                hourlyCron,
                 adCircuitBreakerService,
                 adStats,
-                new MasterEventListener(clusterService, threadPool, deleteUtil, client, clock)
+                new MasterEventListener(clusterService, threadPool, deleteUtil, client, clock, clientUtil)
             );
     }
 
diff --git a/src/main/java/com/amazon/opendistroforelasticsearch/ad/cluster/DailyCron.java b/src/main/java/com/amazon/opendistroforelasticsearch/ad/cluster/DailyCron.java
index f9ce8382..707daa49 100644
--- a/src/main/java/com/amazon/opendistroforelasticsearch/ad/cluster/DailyCron.java
+++ b/src/main/java/com/amazon/opendistroforelasticsearch/ad/cluster/DailyCron.java
@@ -20,6 +20,8 @@
 
 import com.amazon.opendistroforelasticsearch.ad.constant.CommonName;
 import com.amazon.opendistroforelasticsearch.ad.ml.CheckpointDao;
+import com.amazon.opendistroforelasticsearch.ad.util.ClientUtil;
+
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.elasticsearch.action.ActionListener;
@@ -41,11 +43,13 @@ public class DailyCron implements Runnable {
     private final Clock clock;
     private final Client client;
     private final Duration checkpointTtl;
+    private final ClientUtil clientUtil;
 
-    public DailyCron(DeleteDetector deleteUtil, Clock clock, Client client, Duration checkpointTtl) {
+    public DailyCron(DeleteDetector deleteUtil, Clock clock, Client client, Duration checkpointTtl, ClientUtil clientUtil) {
         this.deleteUtil = deleteUtil;
         this.clock = clock;
         this.client = client;
+        this.clientUtil = clientUtil;
         this.checkpointTtl = checkpointTtl;
     }
 
@@ -63,7 +67,7 @@ public void run() {
                     )
             )
             .setIndicesOptions(IndicesOptions.LENIENT_EXPAND_OPEN);
-        client
+        clientUtil
             .execute(
                 DeleteByQueryAction.INSTANCE,
                 deleteRequest,
diff --git a/src/main/java/com/amazon/opendistroforelasticsearch/ad/cluster/MasterEventListener.java b/src/main/java/com/amazon/opendistroforelasticsearch/ad/cluster/MasterEventListener.java
index c1dc4169..a3735579 100644
--- a/src/main/java/com/amazon/opendistroforelasticsearch/ad/cluster/MasterEventListener.java
+++ b/src/main/java/com/amazon/opendistroforelasticsearch/ad/cluster/MasterEventListener.java
@@ -25,6 +25,7 @@
 import org.elasticsearch.threadpool.Scheduler.Cancellable;
 
 import com.amazon.opendistroforelasticsearch.ad.settings.AnomalyDetectorSettings;
+import com.amazon.opendistroforelasticsearch.ad.util.ClientUtil;
 
 import org.elasticsearch.threadpool.ThreadPool;
 
@@ -37,13 +38,15 @@ public class MasterEventListener implements LocalNodeMasterListener {
     private DeleteDetector deleteUtil;
     private Client client;
     private Clock clock;
+    private ClientUtil clientUtil;
 
     public MasterEventListener(
         ClusterService clusterService,
         ThreadPool threadPool,
         DeleteDetector deleteUtil,
         Client client,
-        Clock clock
+        Clock clock,
+        ClientUtil clientUtil
     ) {
         this.clusterService = clusterService;
         this.threadPool = threadPool;
@@ -51,6 +54,7 @@ public MasterEventListener(
         this.client = client;
         this.clusterService.addLocalNodeMasterListener(this);
         this.clock = clock;
+        this.clientUtil = clientUtil;
     }
 
     @Override
@@ -70,7 +74,7 @@ public void beforeStop() {
         if (dailyCron == null) {
             dailyCron = threadPool
                 .scheduleWithFixedDelay(
-                    new DailyCron(deleteUtil, clock, client, AnomalyDetectorSettings.CHECKPOINT_TTL),
+                    new DailyCron(deleteUtil, clock, client, AnomalyDetectorSettings.CHECKPOINT_TTL, clientUtil),
                     TimeValue.timeValueHours(24),
                     executorName()
                 );
diff --git a/src/main/java/com/amazon/opendistroforelasticsearch/ad/util/ClientUtil.java b/src/main/java/com/amazon/opendistroforelasticsearch/ad/util/ClientUtil.java
index 53126609..37431226 100644
--- a/src/main/java/com/amazon/opendistroforelasticsearch/ad/util/ClientUtil.java
+++ b/src/main/java/com/amazon/opendistroforelasticsearch/ad/util/ClientUtil.java
@@ -22,13 +22,17 @@
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.BiConsumer;
+import java.util.function.Function;
 
 import org.apache.logging.log4j.Logger;
 import org.elasticsearch.ElasticsearchTimeoutException;
+import org.elasticsearch.action.Action;
+import org.elasticsearch.action.ActionFuture;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.LatchedActionListener;
+import org.elasticsearch.client.Client;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.unit.TimeValue;
@@ -37,14 +41,16 @@
 
 public class ClientUtil {
     private volatile TimeValue requestTimeout;
+    private Client client;
 
     @Inject
-    public ClientUtil(Settings setting) {
+    public ClientUtil(Settings setting, Client client) {
         this.requestTimeout = REQUEST_TIMEOUT.get(setting);
+        this.client = client;
     }
 
     /**
-     * Generates a nonblocking request with a timeout. Blocking is not allowed in a
+     * Send a nonblocking request with a timeout and return response. Blocking is not allowed in a
      * transport call context. See BaseFuture.blockingAllowed
      * @param request request like index/search/get
      * @param LOG log
@@ -86,4 +92,64 @@ public <Request extends ActionRequest, Response extends ActionResponse> Optional
             throw new IllegalStateException(e1);
         }
     }
+
+    /**
+     * Send an asynchronous request and handle response with the provided listener.
+     * @param <Request> ActionRequest
+     * @param <Response> ActionResponse
+     * @param request request body
+     * @param consumer request method, functional interface to operate as a client request like client::get
+     * @param listener needed to handle response
+     */
+    public <Request extends ActionRequest, Response extends ActionResponse> void asyncRequest(
+        Request request,
+        BiConsumer<Request, ActionListener<Response>> consumer,
+        ActionListener<Response> listener
+    ) {
+        consumer
+            .accept(
+                request,
+                ActionListener.wrap(response -> { listener.onResponse(response); }, exception -> { listener.onFailure(exception); })
+            );
+    }
+
+    /**
+     * Execute a transport action and handle response with the provided listener.
+     * @param <Request> ActionRequest
+     * @param <Response> ActionResponse
+     * @param action transport action
+     * @param request request body
+     * @param listener needed to handle response
+     */
+    public <Request extends ActionRequest, Response extends ActionResponse> void execute(
+        Action<Response> action,
+        Request request,
+        ActionListener<Response> listener
+    ) {
+        client
+            .execute(
+                action,
+                request,
+                ActionListener.wrap(response -> { listener.onResponse(response); }, exception -> { listener.onFailure(exception); })
+            );
+    }
+
+    /**
+     * Send an synchronous request and handle response with the provided listener.
+     *
+     * @deprecated use asyncRequest with listener instead.
+     *
+     * @param <Request> ActionRequest
+     * @param <Response> ActionResponse
+     * @param request request body
+     * @param function request method, functional interface to operate as a client request like client::get
+     * @return the response
+     */
+    @Deprecated
+    public <Request extends ActionRequest, Response extends ActionResponse> Response syncRequest(
+        Request request,
+        Function<Request, ActionFuture<Response>> function
+    ) {
+        return function.apply(request).actionGet(requestTimeout);
+    }
 }
diff --git a/src/test/java/com/amazon/opendistroforelasticsearch/ad/cluster/DailyCronTests.java b/src/test/java/com/amazon/opendistroforelasticsearch/ad/cluster/DailyCronTests.java
index 8deab795..95084c20 100644
--- a/src/test/java/com/amazon/opendistroforelasticsearch/ad/cluster/DailyCronTests.java
+++ b/src/test/java/com/amazon/opendistroforelasticsearch/ad/cluster/DailyCronTests.java
@@ -27,6 +27,7 @@
 import java.util.Arrays;
 
 import com.amazon.opendistroforelasticsearch.ad.AbstractADTest;
+import com.amazon.opendistroforelasticsearch.ad.util.ClientUtil;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.client.Client;
@@ -59,7 +60,8 @@ private void templateDailyCron(DailyCronTestExecutionMode mode) {
         DeleteDetector deleteUtil = mock(DeleteDetector.class);
         Clock clock = mock(Clock.class);
         Client client = mock(Client.class);
-        DailyCron cron = new DailyCron(deleteUtil, clock, client, Duration.ofHours(24));
+        ClientUtil clientUtil = mock(ClientUtil.class);
+        DailyCron cron = new DailyCron(deleteUtil, clock, client, Duration.ofHours(24), clientUtil);
 
         doAnswer(invocation -> {
             Object[] args = invocation.getArguments();
@@ -79,7 +81,7 @@ private void templateDailyCron(DailyCronTestExecutionMode mode) {
             }
 
             return null;
-        }).when(client).execute(eq(DeleteByQueryAction.INSTANCE), any(), any());
+        }).when(clientUtil).execute(eq(DeleteByQueryAction.INSTANCE), any(), any());
 
         doNothing().when(deleteUtil).deleteDetectorResult(eq(client));
 
diff --git a/src/test/java/com/amazon/opendistroforelasticsearch/ad/cluster/MasterEventListenerTests.java b/src/test/java/com/amazon/opendistroforelasticsearch/ad/cluster/MasterEventListenerTests.java
index 31be4f61..0a0a4a17 100644
--- a/src/test/java/com/amazon/opendistroforelasticsearch/ad/cluster/MasterEventListenerTests.java
+++ b/src/test/java/com/amazon/opendistroforelasticsearch/ad/cluster/MasterEventListenerTests.java
@@ -27,6 +27,7 @@
 import java.util.Arrays;
 
 import com.amazon.opendistroforelasticsearch.ad.AbstractADTest;
+import com.amazon.opendistroforelasticsearch.ad.util.ClientUtil;
 import org.elasticsearch.client.Client;
 import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.component.LifecycleListener;
@@ -44,6 +45,7 @@ public class MasterEventListenerTests extends AbstractADTest {
     private Cancellable hourlyCancellable;
     private Cancellable dailyCancellable;
     private MasterEventListener masterService;
+    private ClientUtil clientUtil;
 
     @Override
     @Before
@@ -59,7 +61,8 @@ public void setUp() throws Exception {
         deleteUtil = mock(DeleteDetector.class);
         client = mock(Client.class);
         clock = mock(Clock.class);
-        masterService = new MasterEventListener(clusterService, threadPool, deleteUtil, client, clock);
+        clientUtil = mock(ClientUtil.class);
+        masterService = new MasterEventListener(clusterService, threadPool, deleteUtil, client, clock, clientUtil);
     }
 
     public void testOnOffMaster() {
diff --git a/src/test/java/com/amazon/opendistroforelasticsearch/ad/indices/AnomalyDetectionIndicesTests.java b/src/test/java/com/amazon/opendistroforelasticsearch/ad/indices/AnomalyDetectionIndicesTests.java
index 6fe8fde9..1ddf0396 100644
--- a/src/test/java/com/amazon/opendistroforelasticsearch/ad/indices/AnomalyDetectionIndicesTests.java
+++ b/src/test/java/com/amazon/opendistroforelasticsearch/ad/indices/AnomalyDetectionIndicesTests.java
@@ -15,6 +15,8 @@
 
 package com.amazon.opendistroforelasticsearch.ad.indices;
 
+import static org.mockito.Mockito.mock;
+
 import com.amazon.opendistroforelasticsearch.ad.TestHelpers;
 import com.amazon.opendistroforelasticsearch.ad.model.AnomalyDetector;
 import com.amazon.opendistroforelasticsearch.ad.settings.AnomalyDetectorSettings;
@@ -24,6 +26,7 @@
 import com.amazon.opendistroforelasticsearch.ad.util.RestHandlerUtils;
 import org.elasticsearch.action.index.IndexRequest;
 import org.elasticsearch.action.index.IndexResponse;
+import org.elasticsearch.client.Client;
 import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.settings.ClusterSettings;
 import org.elasticsearch.common.settings.Setting;
@@ -46,6 +49,7 @@ public class AnomalyDetectionIndicesTests extends ESIntegTestCase {
     private ClientUtil requestUtil;
     private Settings settings;
     private ClusterService clusterService;
+    private Client client;
 
     @Before
     public void setup() {
@@ -65,7 +69,8 @@ public void setup() {
         clusterSettings.add(AnomalyDetectorSettings.REQUEST_TIMEOUT);
         clusterSetting = new ClusterSettings(settings, clusterSettings);
         clusterService = TestHelpers.createClusterService(client().threadPool(), clusterSetting);
-        requestUtil = new ClientUtil(settings);
+        client = mock(Client.class);
+        requestUtil = new ClientUtil(settings, client);
         indices = new AnomalyDetectionIndices(client(), clusterService, client().threadPool(), settings, requestUtil);
     }
 
diff --git a/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/ADStateManagerTests.java b/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/ADStateManagerTests.java
index 0623a09b..03267257 100644
--- a/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/ADStateManagerTests.java
+++ b/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/ADStateManagerTests.java
@@ -86,7 +86,15 @@ public void setUp() throws Exception {
             .build();
         clock = mock(Clock.class);
         duration = Duration.ofHours(1);
-        stateManager = new ADStateManager(client, xContentRegistry(), modelManager, settings, new ClientUtil(settings), clock, duration);
+        stateManager = new ADStateManager(
+            client,
+            xContentRegistry(),
+            modelManager,
+            settings,
+            new ClientUtil(settings, client),
+            clock,
+            duration
+        );
 
     }
 
diff --git a/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/ADStatsTransportActionTests.java b/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/ADStatsTransportActionTests.java
index 1514949a..0388da77 100644
--- a/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/ADStatsTransportActionTests.java
+++ b/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/ADStatsTransportActionTests.java
@@ -25,6 +25,7 @@
 import com.amazon.opendistroforelasticsearch.ad.util.IndexUtils;
 import org.elasticsearch.action.FailedNodeException;
 import org.elasticsearch.action.support.ActionFilters;
+import org.elasticsearch.client.Client;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.test.ESIntegTestCase;
 import org.elasticsearch.transport.TransportService;
@@ -53,7 +54,8 @@ public class ADStatsTransportActionTests extends ESIntegTestCase {
     public void setUp() throws Exception {
         super.setUp();
 
-        IndexUtils indexUtils = new IndexUtils(client(), new ClientUtil(Settings.EMPTY), clusterService());
+        Client client = client();
+        IndexUtils indexUtils = new IndexUtils(client, new ClientUtil(Settings.EMPTY, client), clusterService());
         ModelManager modelManager = mock(ModelManager.class);
 
         clusterStatName1 = "clusterStat1";
diff --git a/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/AnomalyResultTests.java b/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/AnomalyResultTests.java
index eced901c..e49973bc 100644
--- a/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/AnomalyResultTests.java
+++ b/src/test/java/com/amazon/opendistroforelasticsearch/ad/transport/AnomalyResultTests.java
@@ -233,7 +233,7 @@ public void setUp() throws Exception {
 
         indexNameResolver = new IndexNameExpressionResolver();
 
-        ClientUtil clientUtil = new ClientUtil(Settings.EMPTY);
+        ClientUtil clientUtil = new ClientUtil(Settings.EMPTY, client);
         IndexUtils indexUtils = new IndexUtils(client, clientUtil, clusterService);
 
         Map<String, ADStat<?>> statsMap = new HashMap<String, ADStat<?>>() {
diff --git a/src/test/java/com/amazon/opendistroforelasticsearch/ad/util/IndexUtilsTests.java b/src/test/java/com/amazon/opendistroforelasticsearch/ad/util/IndexUtilsTests.java
index 96f71ee7..896a1a8a 100644
--- a/src/test/java/com/amazon/opendistroforelasticsearch/ad/util/IndexUtilsTests.java
+++ b/src/test/java/com/amazon/opendistroforelasticsearch/ad/util/IndexUtilsTests.java
@@ -16,6 +16,7 @@
 package com.amazon.opendistroforelasticsearch.ad.util;
 
 import org.elasticsearch.action.support.master.AcknowledgedResponse;
+import org.elasticsearch.client.Client;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.test.ESIntegTestCase;
 import org.junit.Before;
@@ -27,7 +28,8 @@ public class IndexUtilsTests extends ESIntegTestCase {
 
     @Before
     public void setup() {
-        clientUtil = new ClientUtil(Settings.EMPTY);
+        Client client = client();
+        clientUtil = new ClientUtil(Settings.EMPTY, client);
     }
 
     @Test