OZG-4453 add static to class

ozgcloud-elasticsearch-operator/src/main/java/de/ozgcloud/operator/OzgCloudElasticsearchProperties.java

@@ -19,7 +19,7 @@ public class OzgCloudElasticsearchProperties {
 
 	@Getter
 	@Setter
-	public class OzgCloudElasticsearchServerProperties {
+	public static class OzgCloudElasticsearchServerProperties {
 
 		private String namespace;
 		private String secretName;