Add Option to not store the id property in the document source.

pom.xml

@@ -452,7 +452,7 @@
 					</jvmArgs>
 					<excludedGroups>integration-test</excludedGroups>
 					<targetClasses>
-						<param>org.springframework.data.elasticsearch.core.geo.*</param>
+						<param>org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverter*</param>
 					</targetClasses>
 					<excludedMethods>toString</excludedMethods>
 				</configuration>

src/main/java/org/springframework/data/elasticsearch/annotations/Document.java

@@ -77,6 +77,14 @@
 	 */
 	Dynamic dynamic() default Dynamic.INHERIT;
 
+	/**
+	 * Specifies if the id property should also be stored in the Elasticsearch document source. Default value is
+	 * {@literal true}
+	 *
+	 * @since 5.1
+	 */
+	boolean storeIdInSource() default true;
+
 	/**
 	 * @since 4.3
 	 */

src/main/java/org/springframework/data/elasticsearch/core/convert/MappingElasticsearchConverter.java

@@ -939,7 +939,13 @@ private void writeProperties(ElasticsearchPersistentEntity<?> entity, Persistent
 
 			for (ElasticsearchPersistentProperty property : entity) {
 
-				if (!property.isWritable() || property.isIndexedIndexNameProperty()) {
+				if (!property.isWritable() //
+						|| property.isIndexedIndexNameProperty() //
+						|| (property.isIdProperty() && !entity.storeIdInSource())) {
+					continue;
+				}
+
+				if (property.isIdProperty() && !entity.storeIdInSource()) {
 					continue;
 				}
 

src/main/java/org/springframework/data/elasticsearch/core/mapping/ElasticsearchPersistentEntity.java

@@ -175,4 +175,10 @@ default ElasticsearchPersistentProperty getRequiredSeqNoPrimaryTermProperty() {
 	 * @since 4.3
 	 */
 	Dynamic dynamic();
+
+	/**
+	 * @return the storeIdInSource value from the document annotation
+	 * @since 5.1
+	 */
+	boolean storeIdInSource();
 }

src/main/java/org/springframework/data/elasticsearch/core/mapping/SimpleElasticsearchPersistentEntity.java

@@ -27,7 +27,6 @@
 import org.springframework.data.elasticsearch.annotations.Dynamic;
 import org.springframework.data.elasticsearch.annotations.Field;
 import org.springframework.data.elasticsearch.annotations.FieldType;
-import org.springframework.data.elasticsearch.annotations.IndexedIndexName;
 import org.springframework.data.elasticsearch.annotations.Routing;
 import org.springframework.data.elasticsearch.annotations.Setting;
 import org.springframework.data.elasticsearch.core.index.Settings;
@@ -84,6 +83,8 @@ public class SimpleElasticsearchPersistentEntity<T> extends BasicPersistentEntit
 	private final ConcurrentHashMap<String, Expression> indexNameExpressions = new ConcurrentHashMap<>();
 	private final Lazy<EvaluationContext> indexNameEvaluationContext = Lazy.of(this::getIndexNameEvaluationContext);
 
+	private final boolean storeIdInSource;
+
 	public SimpleElasticsearchPersistentEntity(TypeInformation<T> typeInformation,
 			ContextConfiguration contextConfiguration) {
 
@@ -106,8 +107,10 @@ public SimpleElasticsearchPersistentEntity(TypeInformation<T> typeInformation,
 			this.versionType = document.versionType();
 			this.createIndexAndMapping = document.createIndex();
 			this.dynamic = document.dynamic();
+			this.storeIdInSource = document.storeIdInSource();
 		} else {
 			this.dynamic = Dynamic.INHERIT;
+			this.storeIdInSource = true;
 		}
 		Routing routingAnnotation = AnnotatedElementUtils.findMergedAnnotation(clazz, Routing.class);
 
@@ -192,6 +195,11 @@ public boolean writeTypeHints() {
 		return writeTypeHints;
 	}
 
+	@Override
+	public boolean storeIdInSource() {
+		return storeIdInSource;
+	}
+
 	@Override
 	public void addPersistentProperty(ElasticsearchPersistentProperty property) {
 		super.addPersistentProperty(property);

src/test/java/org/springframework/data/elasticsearch/core/convert/MappingElasticsearchConverterUnitTests.java

@@ -1871,6 +1871,28 @@ private Map<String, Object> writeToMap(Object source) {
 		return sink;
 	}
 
+	@Test // #2364
+	@DisplayName("should not write id property to document source if configured so")
+	void shouldNotWriteIdPropertyToDocumentSourceIfConfiguredSo() throws JSONException {
+
+		@Language("JSON")
+		var expected = """
+				{
+					"_class": "org.springframework.data.elasticsearch.core.convert.MappingElasticsearchConverterUnitTests$DontWriteIdToSourceEntity",
+					"text": "some text"
+				}
+				""";
+		var entity = new DontWriteIdToSourceEntity();
+		entity.setId("42");
+		entity.setText("some text");
+
+		Document document = Document.create();
+		mappingElasticsearchConverter.write(entity, document);
+		String json = document.toJson();
+
+		assertEquals(expected, json, true);
+	}
+
 	// region entities
 	public static class Sample {
 		@Nullable public @ReadOnlyProperty String readOnly;
@@ -2885,7 +2907,7 @@ private static final class ImmutableEntityWithCollections {
 		@Nullable private Set<Child> childrenSet;
 
 		public ImmutableEntityWithCollections(@Nullable List<String> stringList, @Nullable Set<String> stringSet,
-																					@Nullable List<Child> childrenList, @Nullable Set<Child> childrenSet) {
+				@Nullable List<Child> childrenList, @Nullable Set<Child> childrenSet) {
 			this.stringList = stringList;
 			this.stringSet = stringSet;
 			this.childrenList = childrenList;
@@ -2927,6 +2949,31 @@ public String getName() {
 			}
 		}
 	}
+
+	@org.springframework.data.elasticsearch.annotations.Document(indexName = "doesnt-matter", storeIdInSource = false)
+	static class DontWriteIdToSourceEntity {
+		@Nullable private String id;
+		@Nullable
+		@Field(type = FieldType.Text) private String text;
+
+		@Nullable
+		public String getId() {
+			return id;
+		}
+
+		public void setId(@Nullable String id) {
+			this.id = id;
+		}
+
+		@Nullable
+		public String getText() {
+			return text;
+		}
+
+		public void setText(@Nullable String text) {
+			this.text = text;
+		}
+	}
 	// endregion
 
 	private static String reverse(Object o) {