Resolve "Die Statistiken sollten auch in ElasticSearch hinterlegt werden."

Related to #384 (closed)

src/main/java/at/ac/uibk/gitsearch/service/UserWatchListService.java

@@ -13,6 +13,7 @@ import at.ac.uibk.gitsearch.web.rest.errors.BadRequestAlertException;
 import java.time.Instant;
 import java.util.List;
 import java.util.Map;
+import java.util.Map.Entry;
 import java.util.Optional;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.stream.Collectors;
@@ -259,6 +260,6 @@ public class UserWatchListService {
             .entrySet()
             .stream()
             .filter(entry -> entry.getValue().getCheckFrequency().ordinal() <= checkFrequency.ordinal())
-            .collect(Collectors.toMap(x -> x.getKey(), x -> x.getValue()));
+            .collect(Collectors.toMap(Entry::getKey, Entry::getValue));
     }
 }