Release version 4.2.8 (2021.0.8).

See #1988

Author: christophstrobl

pom.xml

@@ -5,7 +5,7 @@
 
 	<groupId>org.springframework.data</groupId>
 	<artifactId>spring-data-elasticsearch</artifactId>
-	<version>4.2.8-SNAPSHOT</version>
+	<version>4.2.8</version>
 
 	<parent>
 		<groupId>org.springframework.data.build</groupId>