diff --git a/.github/workflows/test-unit.yml b/.github/workflows/test-unit.yml
index 982d3d957a..14fa9a538f 100644
--- a/.github/workflows/test-unit.yml
+++ b/.github/workflows/test-unit.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        java: [ 11, 17, 21 ]
+        java: [ 8, 11, 17, 21 ]
         os: [ubuntu-latest, windows-latest, macOS-latest]
     steps:
       - name: Checkout Java Client
@@ -21,4 +21,17 @@ jobs:
           cache: 'gradle'
 
       - name: Run Unit Test
+        if: ${{ matrix.java != 8 }}
         run: ./gradlew clean unitTest
+
+      - name: Set up JDK 11
+        uses: actions/setup-java@v3
+        if: ${{ matrix.java == 8 }}
+        with:
+          java-version: 11
+          distribution: 'temurin'
+          cache: 'gradle'
+
+      - name: Run Unit Test
+        if: ${{ matrix.java == 8 }}
+        run: ./gradlew clean unitTest -D"runtime.java=8"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5b2e51cc03..379ff94bcc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,7 @@ This section is for maintaining a changelog for all breaking changes for the cli
 
 ### Changed
 - Restore support for Java 8 ([#767](https://github.com/opensearch-project/opensearch-java/pull/767))
+- Add an integration test that runs on JDK-8 ([#795](https://github.com/opensearch-project/opensearch-java/pull/795))
 
 ### Deprecated
 - Deprecated "_toQuery()" in Query and QueryVariant ([#760](https://github.com/opensearch-project/opensearch-java/pull/760)
diff --git a/java-client/build.gradle.kts b/java-client/build.gradle.kts
index 8d0522d4d0..06c07a4b03 100644
--- a/java-client/build.gradle.kts
+++ b/java-client/build.gradle.kts
@@ -32,6 +32,7 @@
 
 import com.github.jk1.license.ProjectData
 import com.github.jk1.license.render.ReportRenderer
+import org.gradle.api.tasks.testing.Test
 import java.io.FileWriter
 
 buildscript {
@@ -63,6 +64,12 @@ configurations {
     }
 }
 
+val runtimeJavaVersion = (System.getProperty("runtime.java")?.toInt())?.let(JavaVersion::toVersion) ?: JavaVersion.current()
+logger.quiet("=======================================")
+logger.quiet("  Runtime JDK Version   : " + runtimeJavaVersion)
+logger.quiet("  Gradle JDK Version    : " + JavaVersion.current())
+logger.quiet("=======================================")
+
 java {
     targetCompatibility = JavaVersion.VERSION_1_8
     sourceCompatibility = JavaVersion.VERSION_1_8
@@ -73,6 +80,11 @@ java {
     registerFeature("awsSdk2Support") {
         usingSourceSet(sourceSets.get("main"))
     }
+    
+    toolchain {
+      languageVersion = JavaLanguageVersion.of(runtimeJavaVersion.majorVersion)
+      vendor = JvmVendorSpec.ADOPTIUM
+    }
 }
 
 tasks.withType<ProcessResources> {
@@ -337,7 +349,7 @@ publishing {
     }
 }
 
-if (JavaVersion.current() >= JavaVersion.VERSION_11) {
+if (runtimeJavaVersion >= JavaVersion.VERSION_11) {
   val java11: SourceSet = sourceSets.create("java11") {
     java {
       compileClasspath += sourceSets.main.get().output + sourceSets.test.get().output
@@ -369,5 +381,4 @@ if (JavaVersion.current() >= JavaVersion.VERSION_11) {
     testClassesDirs += java11.output.classesDirs
     classpath = sourceSets["java11"].runtimeClasspath
   }
- 
 }
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/GeoDistanceQueryTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/GeoDistanceQueryTest.java
index edaa9edf56..289f5c75a8 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/GeoDistanceQueryTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/GeoDistanceQueryTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch._types.GeoLocation;
 import org.opensearch.client.opensearch.model.ModelTestCase;
@@ -9,7 +9,7 @@ public class GeoDistanceQueryTest extends ModelTestCase {
     @Test
     public void toBuilder() {
         GeoDistanceQuery origin = new GeoDistanceQuery.Builder().field("field")
-            .location(new GeoLocation.Builder().coords(List.of(1.0)).build())
+            .location(new GeoLocation.Builder().coords(Collections.singletonList(1.0)).build())
             .build();
         GeoDistanceQuery copied = origin.toBuilder().build();
 
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/PinnedQueryTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/PinnedQueryTest.java
index 3c779919de..074b7ead70 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/PinnedQueryTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/PinnedQueryTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch._types.FieldValue;
 import org.opensearch.client.opensearch.model.ModelTestCase;
@@ -8,7 +8,7 @@
 public class PinnedQueryTest extends ModelTestCase {
     @Test
     public void toBuilder() {
-        PinnedQuery origin = new PinnedQuery.Builder().organic(buildDummyQuery()).ids(List.of("1")).build();
+        PinnedQuery origin = new PinnedQuery.Builder().organic(buildDummyQuery()).ids(Collections.singletonList("1")).build();
         PinnedQuery copied = origin.toBuilder().build();
 
         assertEquals(toJson(copied), toJson(origin));
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanContainingQueryTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanContainingQueryTest.java
index fabb167771..cbcfa17886 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanContainingQueryTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanContainingQueryTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch.model.ModelTestCase;
 
@@ -8,8 +8,8 @@ public class SpanContainingQueryTest extends ModelTestCase {
     @Test
     public void toBuilder() {
         SpanContainingQuery origin = new SpanContainingQuery.Builder().big(
-            new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(List.of()).build()).build()
-        ).little(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(List.of()).build()).build()).build();
+            new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(Collections.emptyList()).build()).build()
+        ).little(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(Collections.emptyList()).build()).build()).build();
         SpanContainingQuery copied = origin.toBuilder().build();
 
         assertEquals(toJson(copied), toJson(origin));
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanFieldMaskingQueryTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanFieldMaskingQueryTest.java
index af176824f7..d420c9242c 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanFieldMaskingQueryTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanFieldMaskingQueryTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch.model.ModelTestCase;
 
@@ -8,7 +8,7 @@ public class SpanFieldMaskingQueryTest extends ModelTestCase {
     @Test
     public void toBuilder() {
         SpanFieldMaskingQuery origin = new SpanFieldMaskingQuery.Builder().field("field")
-            .query(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(List.of()).build()).build())
+            .query(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(Collections.emptyList()).build()).build())
             .build();
         SpanFieldMaskingQuery copied = origin.toBuilder().build();
 
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanFirstQueryTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanFirstQueryTest.java
index 3b0fbac20c..f9fc4afe7d 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanFirstQueryTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanFirstQueryTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch.model.ModelTestCase;
 
@@ -8,7 +8,7 @@ public class SpanFirstQueryTest extends ModelTestCase {
     @Test
     public void toBuilder() {
         SpanFirstQuery origin = new SpanFirstQuery.Builder().end(1)
-            .match(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(List.of()).build()).build())
+            .match(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(Collections.emptyList()).build()).build())
             .build();
         SpanFirstQuery copied = origin.toBuilder().build();
 
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanNearQueryTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanNearQueryTest.java
index ffff730cf1..f48ded1f69 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanNearQueryTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanNearQueryTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch.model.ModelTestCase;
 
@@ -8,7 +8,9 @@ public class SpanNearQueryTest extends ModelTestCase {
     @Test
     public void toBuilder() {
         SpanNearQuery origin = new SpanNearQuery.Builder().clauses(
-            List.of(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(List.of()).build()).build())
+            Collections.singletonList(
+                new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(Collections.emptyList()).build()).build()
+            )
         ).build();
         SpanNearQuery copied = origin.toBuilder().build();
 
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanNotQueryTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanNotQueryTest.java
index 2a2757d1a6..a5d9d9b14a 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanNotQueryTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanNotQueryTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch.model.ModelTestCase;
 
@@ -8,8 +8,8 @@ public class SpanNotQueryTest extends ModelTestCase {
     @Test
     public void toBuilder() {
         SpanNotQuery origin = new SpanNotQuery.Builder().include(
-            new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(List.of()).build()).build()
-        ).exclude(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(List.of()).build()).build()).build();
+            new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(Collections.emptyList()).build()).build()
+        ).exclude(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(Collections.emptyList()).build()).build()).build();
         SpanNotQuery copied = origin.toBuilder().build();
 
         assertEquals(toJson(copied), toJson(origin));
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanOrQueryTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanOrQueryTest.java
index 407c0717c9..a0c3a83eee 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanOrQueryTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanOrQueryTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch.model.ModelTestCase;
 
@@ -8,7 +8,9 @@ public class SpanOrQueryTest extends ModelTestCase {
     @Test
     public void toBuilder() {
         SpanOrQuery origin = new SpanOrQuery.Builder().clauses(
-            List.of(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(List.of()).build()).build())
+            Collections.singletonList(
+                new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(Collections.emptyList()).build()).build()
+            )
         ).build();
         SpanOrQuery copied = origin.toBuilder().build();
 
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanQueryTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanQueryTest.java
index 5d941045ee..942e67d177 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanQueryTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanQueryTest.java
@@ -1,13 +1,13 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch.model.ModelTestCase;
 
 public class SpanQueryTest extends ModelTestCase {
     @Test
     public void toBuilder() {
-        SpanQuery origin = new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(List.of()).build()).build();
+        SpanQuery origin = new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(Collections.emptyList()).build()).build();
         SpanQuery copied = origin.toBuilder().build();
 
         assertEquals(toJson(copied), toJson(origin));
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanWithinQueryTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanWithinQueryTest.java
index ce71e79c33..42208a9372 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanWithinQueryTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/SpanWithinQueryTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch.model.ModelTestCase;
 
@@ -8,8 +8,8 @@ public class SpanWithinQueryTest extends ModelTestCase {
     @Test
     public void toBuilder() {
         SpanWithinQuery origin = new SpanWithinQuery.Builder().big(
-            new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(List.of()).build()).build()
-        ).little(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(List.of()).build()).build()).build();
+            new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(Collections.emptyList()).build()).build()
+        ).little(new SpanQuery.Builder().spanOr(new SpanOrQuery.Builder().clauses(Collections.emptyList()).build()).build()).build();
         SpanWithinQuery copied = origin.toBuilder().build();
 
         assertEquals(toJson(copied), toJson(origin));
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/TermsQueryFieldTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/TermsQueryFieldTest.java
index 41fb249d51..5af873b206 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/TermsQueryFieldTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/TermsQueryFieldTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch._types.FieldValue;
 import org.opensearch.client.opensearch.model.ModelTestCase;
@@ -8,7 +8,7 @@
 public class TermsQueryFieldTest extends ModelTestCase {
     @Test
     public void toBuilder() {
-        TermsQueryField origin = new TermsQueryField.Builder().value(List.of(FieldValue.of("1"))).build();
+        TermsQueryField origin = new TermsQueryField.Builder().value(Collections.singletonList(FieldValue.of("1"))).build();
         TermsQueryField copied = origin.toBuilder().build();
 
         assertEquals(toJson(copied), toJson(origin));
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/TermsQueryTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/TermsQueryTest.java
index a8bea25397..bf9ed792ec 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/TermsQueryTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/_types/query_dsl/TermsQueryTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch._types.query_dsl;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Test;
 import org.opensearch.client.opensearch._types.FieldValue;
 import org.opensearch.client.opensearch.model.ModelTestCase;
@@ -9,7 +9,7 @@ public class TermsQueryTest extends ModelTestCase {
     @Test
     public void toBuilder() {
         TermsQuery origin = new TermsQuery.Builder().field("field")
-            .terms(new TermsQueryField.Builder().value(List.of(FieldValue.of("1"))).build())
+            .terms(new TermsQueryField.Builder().value(Collections.singletonList(FieldValue.of("1"))).build())
             .build();
         TermsQuery copied = origin.toBuilder().build();
 
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/core/BulkRequestTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/core/BulkRequestTest.java
index c173f1482d..bdb5e01aa2 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/core/BulkRequestTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/core/BulkRequestTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch.core;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Assert;
 import org.junit.Test;
 import org.opensearch.client.opensearch.core.bulk.BulkOperation;
@@ -11,7 +11,9 @@ public class BulkRequestTest extends Assert {
     @Test
     public void toBuilder() {
         BulkRequest origin = new BulkRequest.Builder().index("index")
-            .operations(List.of(new BulkOperation.Builder().delete(new DeleteOperation.Builder().id("id").build()).build()))
+            .operations(
+                Collections.singletonList(new BulkOperation.Builder().delete(new DeleteOperation.Builder().id("id").build()).build())
+            )
             .build();
         BulkRequest copied = origin.toBuilder().build();
 
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/core/ClearScrollRequestTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/core/ClearScrollRequestTest.java
index cc80c857d7..fea512e074 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/core/ClearScrollRequestTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/core/ClearScrollRequestTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch.core;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Assert;
 import org.junit.Test;
 
@@ -8,7 +8,7 @@ public class ClearScrollRequestTest extends Assert {
 
     @Test
     public void toBuilder() {
-        ClearScrollRequest origin = new ClearScrollRequest.Builder().scrollId(List.of("1")).build();
+        ClearScrollRequest origin = new ClearScrollRequest.Builder().scrollId(Collections.singletonList("1")).build();
         ClearScrollRequest copied = origin.toBuilder().build();
 
         assertEquals(copied.scrollId(), origin.scrollId());
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/core/MsearchRequestTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/core/MsearchRequestTest.java
index 166a2e0e6c..da470f0d31 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/core/MsearchRequestTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/core/MsearchRequestTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch.core;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Assert;
 import org.junit.Test;
 
@@ -8,7 +8,7 @@ public class MsearchRequestTest extends Assert {
 
     @Test
     public void toBuilder() {
-        MsearchRequest origin = new MsearchRequest.Builder().index("index").searches(List.of()).build();
+        MsearchRequest origin = new MsearchRequest.Builder().index("index").searches(Collections.emptyList()).build();
         MsearchRequest copied = origin.toBuilder().build();
 
         assertEquals(copied.index(), origin.index());
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/core/MsearchTemplateRequestTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/core/MsearchTemplateRequestTest.java
index c741332568..c2a41d7d1c 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/core/MsearchTemplateRequestTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/core/MsearchTemplateRequestTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch.core;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Assert;
 import org.junit.Test;
 
@@ -8,7 +8,9 @@ public class MsearchTemplateRequestTest extends Assert {
 
     @Test
     public void toBuilder() {
-        MsearchTemplateRequest origin = new MsearchTemplateRequest.Builder().index("index").searchTemplates(List.of()).build();
+        MsearchTemplateRequest origin = new MsearchTemplateRequest.Builder().index("index")
+            .searchTemplates(Collections.emptyList())
+            .build();
         MsearchTemplateRequest copied = origin.toBuilder().build();
 
         assertEquals(copied.index(), origin.index());
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/core/PutIndexTemplateRequestTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/core/PutIndexTemplateRequestTest.java
index eb95320333..6de5b06252 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/core/PutIndexTemplateRequestTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/core/PutIndexTemplateRequestTest.java
@@ -2,8 +2,10 @@
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import jakarta.json.stream.JsonParser;
 import java.io.StringReader;
-import java.util.List;
+import java.util.Collections;
+import java.util.HashMap;
 import java.util.Map;
 import org.junit.Assert;
 import org.junit.Test;
@@ -16,15 +18,19 @@ public class PutIndexTemplateRequestTest extends Assert {
     @Test
     public void deserialize_validFieldsIncluded_RequestIsBuilt() throws JsonProcessingException {
         final JsonpMapper mapper = new JsonbJsonpMapper();
-        final Map<String, Object> indexTemplateMap = Map.of("name", "test", "index_patterns", "*", "create", true, "priority", 1);
+        final Map<String, Object> indexTemplateMap = new HashMap<>();
+        indexTemplateMap.put("name", "test");
+        indexTemplateMap.put("index_patterns", "*");
+        indexTemplateMap.put("create", true);
+        indexTemplateMap.put("priority", 1);
 
         final String indexTemplate = new ObjectMapper().writeValueAsString(indexTemplateMap);
-        final var parser = mapper.jsonProvider().createParser(new StringReader(indexTemplate));
+        final JsonParser parser = mapper.jsonProvider().createParser(new StringReader(indexTemplate));
 
         final PutIndexTemplateRequest putIndexTemplateRequest = PutIndexTemplateRequest._DESERIALIZER.deserialize(parser, mapper);
 
         assertEquals(putIndexTemplateRequest.name(), "test");
-        assertEquals(putIndexTemplateRequest.indexPatterns(), List.of("*"));
+        assertEquals(putIndexTemplateRequest.indexPatterns(), Collections.singletonList("*"));
         assertEquals((int) putIndexTemplateRequest.priority(), 1);
     }
 
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/core/RankEvalRequestTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/core/RankEvalRequestTest.java
index babf2a7aec..83e8f27057 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/core/RankEvalRequestTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/core/RankEvalRequestTest.java
@@ -1,6 +1,6 @@
 package org.opensearch.client.opensearch.core;
 
-import java.util.List;
+import java.util.Collections;
 import org.junit.Assert;
 import org.junit.Test;
 
@@ -8,7 +8,7 @@ public class RankEvalRequestTest extends Assert {
 
     @Test
     public void toBuilder() {
-        RankEvalRequest origin = new RankEvalRequest.Builder().index("index").requests(List.of()).build();
+        RankEvalRequest origin = new RankEvalRequest.Builder().index("index").requests(Collections.emptyList()).build();
         RankEvalRequest copied = origin.toBuilder().build();
 
         assertEquals(copied.index(), origin.index());
diff --git a/java-client/src/test/java/org/opensearch/client/opensearch/core/search/InnerHitsTest.java b/java-client/src/test/java/org/opensearch/client/opensearch/core/search/InnerHitsTest.java
index 1269ebb0df..b9b4cdfa71 100644
--- a/java-client/src/test/java/org/opensearch/client/opensearch/core/search/InnerHitsTest.java
+++ b/java-client/src/test/java/org/opensearch/client/opensearch/core/search/InnerHitsTest.java
@@ -9,7 +9,7 @@
 import jakarta.json.stream.JsonParser;
 import java.io.StringReader;
 import java.io.StringWriter;
-import java.util.List;
+import java.util.Arrays;
 import org.junit.Test;
 import org.opensearch.client.json.JsonpMapper;
 import org.opensearch.client.json.JsonpSerializable;
@@ -26,7 +26,7 @@ public class InnerHitsTest {
      */
     @Test
     public void testInnerHitStoredFields() {
-        InnerHits hits = InnerHits.of((it) -> it.storedFields(List.of("field1", "field2")));
+        InnerHits hits = InnerHits.of((it) -> it.storedFields(Arrays.asList("field1", "field2")));
         assertTrue(toJson(hits).contains("stored_fields"));
     }
 
diff --git a/settings.gradle.kts b/settings.gradle.kts
index 6d462291d4..9c04316123 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -30,6 +30,10 @@
  * GitHub history for details.
  */
 
+plugins {
+  id("org.gradle.toolchains.foojay-resolver-convention") version("0.7.0")
+}
+
 rootProject.name = "opensearch-java"
 include("java-client")
-include("samples")
\ No newline at end of file
+include("samples")