diff --git a/module/spring-boot-data-elasticsearch-test/build.gradle b/module/spring-boot-data-elasticsearch-test/build.gradle
index cb71861c576..0be074f5731 100644
--- a/module/spring-boot-data-elasticsearch-test/build.gradle
+++ b/module/spring-boot-data-elasticsearch-test/build.gradle
@@ -46,3 +46,11 @@ dependencies {
 
 	testRuntimeOnly("ch.qos.logback:logback-classic")
 }
+
+tasks.named("compileTestJava") {
+	options.nullability.checking = "tests"
+}
+
+tasks.named("compileDockerTestJava") {
+	options.nullability.checking = "tests"
+}
diff --git a/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/DataElasticsearchTestReactiveIntegrationTests.java b/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/DataElasticsearchTestReactiveIntegrationTests.java
index ccc3ab2d2c6..c9898959ceb 100644
--- a/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/DataElasticsearchTestReactiveIntegrationTests.java
+++ b/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/DataElasticsearchTestReactiveIntegrationTests.java
@@ -58,6 +58,7 @@ class DataElasticsearchTestReactiveIntegrationTests {
 		ExampleDocument exampleDocument = new ExampleDocument();
 		exampleDocument.setText("Look, new @DataElasticsearchTest!");
 		exampleDocument = this.exampleReactiveRepository.save(exampleDocument).block(Duration.ofSeconds(30));
+		assertThat(exampleDocument).isNotNull();
 		assertThat(exampleDocument.getId()).isNotNull();
 		assertThat(this.elasticsearchTemplate.exists(exampleDocument.getId(), ExampleDocument.class)
 			.block(Duration.ofSeconds(30))).isTrue();
diff --git a/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/DataElasticsearchTestWithIncludeFilterIntegrationTests.java b/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/DataElasticsearchTestWithIncludeFilterIntegrationTests.java
index ad6af437757..ece922ebd26 100644
--- a/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/DataElasticsearchTestWithIncludeFilterIntegrationTests.java
+++ b/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/DataElasticsearchTestWithIncludeFilterIntegrationTests.java
@@ -61,6 +61,7 @@ class DataElasticsearchTestWithIncludeFilterIntegrationTests {
 		String id = UUID.randomUUID().toString();
 		document.setId(id);
 		ExampleDocument savedDocument = this.exampleRepository.save(document);
+		assertThat(savedDocument.getId()).isNotNull();
 		assertThat(this.service.findById(savedDocument.getId())).isNotNull();
 	}
 
diff --git a/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/ExampleDocument.java b/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/ExampleDocument.java
index 9cca99ae960..f1f35d29bc7 100644
--- a/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/ExampleDocument.java
+++ b/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/ExampleDocument.java
@@ -16,6 +16,8 @@
 
 package org.springframework.boot.data.elasticsearch.test.autoconfigure;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.data.annotation.Id;
 import org.springframework.data.elasticsearch.annotations.Document;
 
@@ -28,23 +30,23 @@ import org.springframework.data.elasticsearch.annotations.Document;
 public class ExampleDocument {
 
 	@Id
-	private String id;
+	private @Nullable String id;
 
-	private String text;
+	private @Nullable String text;
 
-	public String getId() {
+	public @Nullable String getId() {
 		return this.id;
 	}
 
-	public void setId(String id) {
+	public void setId(@Nullable String id) {
 		this.id = id;
 	}
 
-	public String getText() {
+	public @Nullable String getText() {
 		return this.text;
 	}
 
-	public void setText(String text) {
+	public void setText(@Nullable String text) {
 		this.text = text;
 	}
 
diff --git a/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/ExampleService.java b/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/ExampleService.java
index 59ff347ec7f..d21e62f168c 100644
--- a/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/ExampleService.java
+++ b/module/spring-boot-data-elasticsearch-test/src/dockerTest/java/org/springframework/boot/data/elasticsearch/test/autoconfigure/ExampleService.java
@@ -16,6 +16,8 @@
 
 package org.springframework.boot.data.elasticsearch.test.autoconfigure;
 
+import org.jspecify.annotations.Nullable;
+
 import org.springframework.data.elasticsearch.client.elc.ElasticsearchTemplate;
 import org.springframework.stereotype.Service;
 
@@ -33,7 +35,7 @@ public class ExampleService {
 		this.elasticsearchTemplate = elasticsearchRestTemplate;
 	}
 
-	public ExampleDocument findById(String id) {
+	public @Nullable ExampleDocument findById(String id) {
 		return this.elasticsearchTemplate.get(id, ExampleDocument.class);
 	}