Skip metadata lookup for top-level collections in MappingRedisConverter.

Closes: #2168
Original Pull Request: #3146

Signed-off-by: dlguddn3024 <dlguddn3024@gmail.com>

Author: Leehyoungwoo

src/main/java/org/springframework/data/redis/core/convert/MappingRedisConverter.java

@@ -109,6 +109,7 @@
  * @author Greg Turnquist
  * @author Mark Paluch
  * @author Golam Mazid Sajib
+ * @author Leehyoungwoo
  * @since 1.7
  */
 public class MappingRedisConverter implements RedisConverter, InitializingBean {
@@ -402,6 +403,17 @@ public void write(@Nullable Object source, RedisData sink) {
 			return;
 		}
 
+		if (source instanceof Collection) {
+			writeCollection(
+					sink.getKeyspace(),
+					"",
+					(List<?>) source,
+					TypeInformation.of(Object.class),
+					sink
+			);
+			return;
+		}
+
 		RedisPersistentEntity<?> entity = mappingContext.getPersistentEntity(source.getClass());
 
 		if (!customConversions.hasCustomWriteTarget(source.getClass())) {

src/test/java/org/springframework/data/redis/core/convert/MappingRedisConverterUnitTests.java

@@ -1997,9 +1997,8 @@ void readGenericEntity() {
 		assertThat(generic.entity.name).isEqualTo("hello");
 	}
 
-	@Test // DATAREDIS-1175
-	@EnabledOnJre(JRE.JAVA_8)
-		// FIXME: https://github.com/spring-projects/spring-data-redis/issues/2168
+	@Test // GH-2168
+//	@EnabledOnJre(JRE.JAVA_8)
 	void writePlainList() {
 
 		List<Object> source = Arrays.asList("Hello", "stream", "message", 100L);