CriteriaQuery must use nested query only with properties of type nested.

Original Pull Request #1763
Closes #1761

Author: sothawo

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

@@ -33,6 +33,7 @@
 import org.springframework.core.convert.support.DefaultConversionService;
 import org.springframework.core.convert.support.GenericConversionService;
 import org.springframework.data.convert.CustomConversions;
+import org.springframework.data.elasticsearch.annotations.FieldType;
 import org.springframework.data.elasticsearch.annotations.ScriptedField;
 import org.springframework.data.elasticsearch.core.document.Document;
 import org.springframework.data.elasticsearch.core.document.SearchDocument;
@@ -1055,12 +1056,22 @@ private void updateCriteria(Criteria criteria, ElasticsearchPersistentEntity<?>
 		ElasticsearchPersistentEntity<?> currentEntity = persistentEntity;
 		ElasticsearchPersistentProperty persistentProperty = null;
 		int propertyCount = 0;
+		boolean isNested = false;
+
 		for (int i = 0; i < fieldNames.length; i++) {
 			persistentProperty = currentEntity.getPersistentProperty(fieldNames[i]);
 
 			if (persistentProperty != null) {
 				propertyCount++;
 				fieldNames[i] = persistentProperty.getFieldName();
+
+				org.springframework.data.elasticsearch.annotations.Field fieldAnnotation = persistentProperty
+						.findAnnotation(org.springframework.data.elasticsearch.annotations.Field.class);
+
+				if (fieldAnnotation != null && fieldAnnotation.type() == FieldType.Nested) {
+					isNested = true;
+				}
+
 				try {
 					currentEntity = mappingContext.getPersistentEntity(persistentProperty.getActualType());
 				} catch (Exception e) {
@@ -1077,7 +1088,7 @@ private void updateCriteria(Criteria criteria, ElasticsearchPersistentEntity<?>
 
 		field.setName(String.join(".", fieldNames));
 
-		if (propertyCount > 1) {
+		if (propertyCount > 1 && isNested) {
 			List<String> propertyNames = Arrays.asList(fieldNames);
 			field.setPath(String.join(".", propertyNames.subList(0, propertyCount - 1)));
 		}

Diff for: src/test/java/org/springframework/data/elasticsearch/core/CriteriaQueryMappingUnitTests.java

@@ -397,6 +397,34 @@ void shouldMapNamesAndValueInNestedEntitiesWithSubfields() throws JSONException
 
 		assertEquals(expected, queryString, false);
 	}
+
+	@Test // #1761
+	@DisplayName("should map names and value in object entities")
+	void shouldMapNamesAndValueInObjectEntities() throws JSONException {
+
+		String expected = "{\n" + //
+				"  \"bool\": {\n" + //
+				"    \"must\": [\n" + //
+				"      {\n" + //
+				"         \"query_string\": {\n" + //
+				"              \"query\": \"03.10.1999\",\n" + //
+				"              \"fields\": [\n" + //
+				"                \"per-sons.birth-date^1.0\"\n" + //
+				"              ]\n" + //
+				"            }\n" + //
+				"      }\n" + //
+				"    ]\n" + //
+				"  }\n" + //
+				"}\n"; //
+
+		CriteriaQuery criteriaQuery = new CriteriaQuery(
+				new Criteria("persons.birthDate").is(LocalDate.of(1999, 10, 3))
+		);
+		mappingElasticsearchConverter.updateQuery(criteriaQuery, ObjectWithPerson.class);
+		String queryString = new CriteriaQueryProcessor().createQuery(criteriaQuery.getCriteria()).toString();
+
+		assertEquals(expected, queryString, false);
+	}
 	// endregion
 
 	// region helper functions
@@ -427,6 +455,13 @@ static class House {
 		List<Person> persons;
 	}
 
+	static class ObjectWithPerson {
+		@Nullable @Id String id;
+		@Nullable
+		@Field(name = "per-sons", type = FieldType.Object)
+		List<Person> persons;
+	}
+
 	static class GeoShapeEntity {
 		@Nullable @Field(name = "geo-shape-field") GeoJson<?> geoShapeField;
 	}