diff --git a/src/test/java/org/opensearch/neuralsearch/query/HybridQueryBuilderTests.java b/src/test/java/org/opensearch/neuralsearch/query/HybridQueryBuilderTests.java
index 49d1ba974..0544feff8 100644
--- a/src/test/java/org/opensearch/neuralsearch/query/HybridQueryBuilderTests.java
+++ b/src/test/java/org/opensearch/neuralsearch/query/HybridQueryBuilderTests.java
@@ -28,6 +28,8 @@
 import org.apache.lucene.search.MatchNoDocsQuery;
 import org.apache.lucene.search.Query;
 import org.apache.lucene.search.TermQuery;
+import org.opensearch.Version;
+import org.opensearch.cluster.service.ClusterService;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.core.ParseField;
@@ -51,6 +53,8 @@
 import org.opensearch.knn.index.mapper.KNNVectorFieldMapper;
 import org.opensearch.knn.index.query.KNNQuery;
 import org.opensearch.knn.index.query.KNNQueryBuilder;
+import org.opensearch.neuralsearch.util.NeuralSearchClusterTestUtils;
+import org.opensearch.neuralsearch.util.NeuralSearchClusterUtil;
 
 import com.carrotsearch.randomizedtesting.RandomizedTest;
 
@@ -235,6 +239,7 @@ public void testDoToQuery_whenTooManySubqueries_thenFail() {
      */
     @SneakyThrows
     public void testFromXContent_whenMultipleSubQueries_thenBuildSuccessfully() {
+        setUpClusterService();
         XContentBuilder xContentBuilder = XContentFactory.jsonBuilder()
             .startObject()
             .startArray("queries")
@@ -412,6 +417,7 @@ public void testToXContent_whenIncomingJsonIsCorrect_thenSuccessful() {
 
     @SneakyThrows
     public void testStreams_whenWrittingToStream_thenSuccessful() {
+        setUpClusterService();
         HybridQueryBuilder original = new HybridQueryBuilder();
         NeuralQueryBuilder neuralQueryBuilder = new NeuralQueryBuilder().fieldName(VECTOR_FIELD_NAME)
             .queryText(QUERY_TEXT)
@@ -716,4 +722,9 @@ private Map<String, Object> getInnerMap(Object innerObject, String queryName, St
         Map<String, Object> vectorFieldInnerMap = (Map<String, Object>) neuralInnerMap.get(fieldName);
         return vectorFieldInnerMap;
     }
+
+    private void setUpClusterService() {
+        ClusterService clusterService = NeuralSearchClusterTestUtils.mockClusterService(Version.CURRENT);
+        NeuralSearchClusterUtil.instance().initialize(clusterService);
+    }
 }
diff --git a/src/test/java/org/opensearch/neuralsearch/query/NeuralQueryBuilderTests.java b/src/test/java/org/opensearch/neuralsearch/query/NeuralQueryBuilderTests.java
index f389dfd22..d883fe616 100644
--- a/src/test/java/org/opensearch/neuralsearch/query/NeuralQueryBuilderTests.java
+++ b/src/test/java/org/opensearch/neuralsearch/query/NeuralQueryBuilderTests.java
@@ -29,7 +29,9 @@
 
 import lombok.SneakyThrows;
 
+import org.opensearch.Version;
 import org.opensearch.client.Client;
+import org.opensearch.cluster.service.ClusterService;
 import org.opensearch.common.io.stream.BytesStreamOutput;
 import org.opensearch.common.xcontent.XContentFactory;
 import org.opensearch.core.ParseField;
@@ -50,6 +52,8 @@
 import org.opensearch.knn.index.query.KNNQueryBuilder;
 import org.opensearch.neuralsearch.common.VectorUtil;
 import org.opensearch.neuralsearch.ml.MLCommonsClientAccessor;
+import org.opensearch.neuralsearch.util.NeuralSearchClusterTestUtils;
+import org.opensearch.neuralsearch.util.NeuralSearchClusterUtil;
 import org.opensearch.test.OpenSearchTestCase;
 
 public class NeuralQueryBuilderTests extends OpenSearchTestCase {
@@ -75,6 +79,7 @@ public void testFromXContent_whenBuiltWithDefaults_thenBuildSuccessfully() {
               }
           }
         */
+        setUpClusterService();
         XContentBuilder xContentBuilder = XContentFactory.jsonBuilder()
             .startObject()
             .startObject(FIELD_NAME)
@@ -107,6 +112,7 @@ public void testFromXContent_whenBuiltWithOptionals_thenBuildSuccessfully() {
               }
           }
         */
+        setUpClusterService();
         XContentBuilder xContentBuilder = XContentFactory.jsonBuilder()
             .startObject()
             .startObject(FIELD_NAME)
@@ -146,6 +152,7 @@ public void testFromXContent_whenBuiltWithFilter_thenBuildSuccessfully() {
               }
           }
         */
+        setUpClusterService();
         XContentBuilder xContentBuilder = XContentFactory.jsonBuilder()
             .startObject()
             .startObject(FIELD_NAME)
@@ -334,6 +341,7 @@ public void testToXContent() {
 
     @SneakyThrows
     public void testStreams() {
+        setUpClusterService();
         NeuralQueryBuilder original = new NeuralQueryBuilder();
         original.fieldName(FIELD_NAME);
         original.queryText(QUERY_TEXT);
@@ -572,4 +580,9 @@ public void testRewrite_whenFilterSet_thenKNNQueryBuilderFilterSet() {
         KNNQueryBuilder knnQueryBuilder = (KNNQueryBuilder) queryBuilder;
         assertEquals(neuralQueryBuilder.filter(), knnQueryBuilder.getFilter());
     }
+
+    private void setUpClusterService() {
+        ClusterService clusterService = NeuralSearchClusterTestUtils.mockClusterService(Version.CURRENT);
+        NeuralSearchClusterUtil.instance().initialize(clusterService);
+    }
 }