Propagate retryWrites flag to ReactiveMongoClient

Add retryWrites flag to set of flags propagated from connection string
to ReactiveMongoClient.

Regular MongoClientFactory relies of MongoClientURI class that
propagates all flags in its getOptions() method.

Author: GreyTeardrop

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/mongo/ReactiveMongoClientFactory.java

@@ -159,6 +159,7 @@ private Builder createBuilder(MongoClientSettings settings,
 		if (connection.getApplicationName() != null) {
 			builder.applicationName(connection.getApplicationName());
 		}
+		builder.retryWrites(connection.getRetryWrites());
 		return builder;
 	}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/mongo/ReactiveMongoClientFactoryTests.java

@@ -112,6 +112,14 @@ public void uriCanBeCustomized() {
 		assertMongoCredential(credential, "user", "secret", "test");
 	}
 
+	@Test
+	public void retryWritesIsPropagatedFromUri() {
+		MongoProperties properties = new MongoProperties();
+		properties.setUri("mongodb://localhost/test?retryWrites=true");
+		MongoClient client = createMongoClient(properties);
+		assertThat(client.getSettings().getRetryWrites()).isTrue();
+	}
+
 	@Test
 	public void uriCannotBeSetWithCredentials() {
 		MongoProperties properties = new MongoProperties();