DynamicMapping annotation should be applicable to any object field.

Original Pull Request #1779
Closes #1767

src/main/java/org/springframework/data/elasticsearch/core/index/MappingBuilder.java

@@ -216,6 +216,7 @@ private void buildPropertyMapping(XContentBuilder builder, boolean isRootObject,
 		Field fieldAnnotation = property.findAnnotation(Field.class);
 		boolean isCompletionProperty = property.isCompletionProperty();
 		boolean isNestedOrObjectProperty = isNestedOrObjectProperty(property);
+		DynamicMapping dynamicMapping = property.findAnnotation(DynamicMapping.class);
 
 		if (!isCompletionProperty && property.isEntity() && hasRelevantAnnotation(property)) {
 
@@ -230,7 +231,7 @@ private void buildPropertyMapping(XContentBuilder builder, boolean isRootObject,
 						: null;
 
 				mapEntity(builder, persistentEntity, false, property.getFieldName(), true, fieldAnnotation.type(),
-						fieldAnnotation, property.findAnnotation(DynamicMapping.class));
+						fieldAnnotation, dynamicMapping);
 				return;
 			}
 		}
@@ -245,9 +246,9 @@ private void buildPropertyMapping(XContentBuilder builder, boolean isRootObject,
 		if (isRootObject && fieldAnnotation != null && property.isIdProperty()) {
 			applyDefaultIdFieldMapping(builder, property);
 		} else if (multiField != null) {
-			addMultiFieldMapping(builder, property, multiField, isNestedOrObjectProperty);
+			addMultiFieldMapping(builder, property, multiField, isNestedOrObjectProperty, dynamicMapping);
 		} else if (fieldAnnotation != null) {
-			addSingleFieldMapping(builder, property, fieldAnnotation, isNestedOrObjectProperty);
+			addSingleFieldMapping(builder, property, fieldAnnotation, isNestedOrObjectProperty, dynamicMapping);
 		}
 	}
 
@@ -328,7 +329,7 @@ private void applyDefaultIdFieldMapping(XContentBuilder builder, ElasticsearchPe
 	 * @throws IOException
 	 */
 	private void addSingleFieldMapping(XContentBuilder builder, ElasticsearchPersistentProperty property,
-			Field annotation, boolean nestedOrObjectField) throws IOException {
+			Field annotation, boolean nestedOrObjectField, @Nullable DynamicMapping dynamicMapping) throws IOException {
 
 		// build the property json, if empty skip it as this is no valid mapping
 		XContentBuilder propertyBuilder = jsonBuilder().startObject();
@@ -340,6 +341,11 @@ private void addSingleFieldMapping(XContentBuilder builder, ElasticsearchPersist
 		}
 
 		builder.startObject(property.getFieldName());
+
+		if (nestedOrObjectField && dynamicMapping != null) {
+			builder.field(TYPE_DYNAMIC, dynamicMapping.value().name().toLowerCase());
+		}
+
 		addFieldMappingParameters(builder, annotation, nestedOrObjectField);
 		builder.endObject();
 	}
@@ -380,10 +386,15 @@ private void addJoinFieldMapping(XContentBuilder builder, ElasticsearchPersisten
 	 * @throws IOException
 	 */
 	private void addMultiFieldMapping(XContentBuilder builder, ElasticsearchPersistentProperty property,
-			MultiField annotation, boolean nestedOrObjectField) throws IOException {
+			MultiField annotation, boolean nestedOrObjectField, @Nullable DynamicMapping dynamicMapping) throws IOException {
 
 		// main field
 		builder.startObject(property.getFieldName());
+
+		if (nestedOrObjectField && dynamicMapping != null) {
+			builder.field(TYPE_DYNAMIC, dynamicMapping.value().name().toLowerCase());
+		}
+
 		addFieldMappingParameters(builder, annotation.mainField(), nestedOrObjectField);
 
 		// inner fields

src/test/java/org/springframework/data/elasticsearch/core/index/MappingBuilderIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2020 the original author or authors.
+ * Copyright 2013-2021 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,6 +30,7 @@
 import lombok.Setter;
 
 import java.lang.Integer;
+import java.lang.Object;
 import java.math.BigDecimal;
 import java.util.Collection;
 import java.util.Collections;
@@ -263,11 +264,21 @@ void shouldWriteCorrectTermVectorValues() {
 	/**
 	 * @author Xiao Yu
 	 */
-	@Setter
-	@Getter
-	@NoArgsConstructor
-	@AllArgsConstructor
-	@Builder
+	@Test // #1767
+	@DisplayName("should write dynamic mapping entries")
+	void shouldWriteDynamicMappingEntries() {
+
+		IndexOperations indexOps = operations.indexOps(DynamicMappingEntity.class);
+		indexOps.create();
+		indexOps.putMapping();
+		indexOps.delete();
+	}
+
+    @Setter
+    @Getter
+    @NoArgsConstructor
+    @AllArgsConstructor
+    @Builder
 	@Document(indexName = "ignore-above-index")
 	static class IgnoreAboveEntity {
 
@@ -647,4 +658,25 @@ static class TermVectorFieldEntity {
 		@Field(type = FieldType.Text,
 				termVector = TermVector.with_positions_offsets_payloads) private String with_positions_offsets_payloads;
 	}
+
+	@Document(indexName = "dynamic-mapping")
+	@DynamicMapping(DynamicMappingValue.False)
+	static class DynamicMappingEntity {
+
+		@Nullable @DynamicMapping(DynamicMappingValue.Strict) @Field(type = FieldType.Object) private Author author;
+		@Nullable @DynamicMapping(DynamicMappingValue.False) @Field(
+				type = FieldType.Object) private Map<String, Object> objectMap;
+		@Nullable @DynamicMapping(DynamicMappingValue.False) @Field(
+				type = FieldType.Nested) private List<Map<String, Object>> nestedObjectMap;
+
+		@Nullable
+		public Author getAuthor() {
+			return author;
+		}
+
+		public void setAuthor(Author author) {
+			this.author = author;
+		}
+	}
+
 }

src/test/java/org/springframework/data/elasticsearch/core/index/MappingBuilderUnitTests.java

@@ -37,6 +37,7 @@
 import java.util.Date;
 import java.util.HashMap;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Map;
 import java.util.Set;
 
@@ -410,19 +411,28 @@ public void shouldSetFieldMappingProperties() throws JSONException {
 		assertEquals(expected, mapping, true);
 	}
 
-	@Test
+	@Test // DATAES-148, #1767
 	void shouldWriteDynamicMappingSettings() throws JSONException {
 
 		String expected = "{\n" + //
-				"    \"dynamic\": \"false\",\n" + //
-				"    \"properties\": {\n" + //
-				"      \"author\": {\n" + //
-				"        \"dynamic\": \"strict\",\n" + //
-				"        \"type\": \"object\",\n" + //
-				"        \"properties\": {}\n" + //
+				"  \"dynamic\": \"false\",\n" + //
+				"  \"properties\": {\n" + //
+				"    \"author\": {\n" + //
+				"      \"type\": \"object\",\n" + //
+				"      \"dynamic\": \"strict\",\n" + //
+				"      \"properties\": {\n" + //
 				"      }\n" + //
+				"    },\n" + //
+				"    \"objectMap\": {\n" + //
+				"      \"type\": \"object\",\n" + //
+				"      \"dynamic\": \"false\"\n" + //
+				"    },\n" + //
+				"    \"nestedObjectMap\": {\n" + //
+				"      \"type\": \"nested\",\n" + //
+				"      \"dynamic\": \"false\"\n" + //
 				"    }\n" + //
-				"}\n";
+				"  }\n" + //
+				"}"; //
 
 		String mapping = getMappingBuilder().buildPropertyMapping(ConfigureDynamicMappingEntity.class);
 
@@ -898,6 +908,10 @@ static class FieldMappingParameters {
 	static class ConfigureDynamicMappingEntity {
 
 		@Nullable @DynamicMapping(DynamicMappingValue.Strict) @Field(type = FieldType.Object) private Author author;
+		@Nullable @DynamicMapping(DynamicMappingValue.False) @Field(
+				type = FieldType.Object) private Map<String, Object> objectMap;
+		@Nullable @DynamicMapping(DynamicMappingValue.False) @Field(
+				type = FieldType.Nested) private List<Map<String, Object>> nestedObjectMap;
 
 		@Nullable
 		public Author getAuthor() {