minor improvements

kafka-ui-api/src/main/java/com/provectus/kafka/ui/emitter/BackwardRecordEmitter.java

@@ -78,12 +78,7 @@ public class BackwardRecordEmitter extends AbstractEmitter {
           log.debug("sink is cancelled after partitions poll iteration");
         }
       }
-      sendFinishStatsAndCompleteSink(
-          sink,
-          readUntilOffsets.isEmpty()
-              ? null
-              : cursor
-      );
+      sendFinishStatsAndCompleteSink(sink, readUntilOffsets.isEmpty() ? null : cursor);
       log.debug("Polling finished");
     } catch (InterruptException kafkaInterruptException) {
       log.debug("Polling finished due to thread interruption");

kafka-ui-api/src/main/java/com/provectus/kafka/ui/service/MessagesService.java

@@ -67,7 +67,7 @@ public class MessagesService {
   private final int defaultPageSize;
 
   private final Cache<String, Predicate<TopicMessageDTO>> registeredFilters = CacheBuilder.newBuilder()
-      .maximumSize(5_000)
+      .maximumSize(PollingCursorsStorage.MAX_SIZE)
       .build();
 
   private final PollingCursorsStorage cursorsStorage = new PollingCursorsStorage();

kafka-ui-api/src/main/java/com/provectus/kafka/ui/service/PollingCursorsStorage.java

@@ -10,8 +10,10 @@ import org.apache.commons.lang3.RandomStringUtils;
 
 public class PollingCursorsStorage {
 
+  public static final int MAX_SIZE = 10_000;
+
   private final Cache<String, Cursor> cursorsCache = CacheBuilder.newBuilder()
-      .maximumSize(10_000)
+      .maximumSize(MAX_SIZE)
       .build();
 
   public Optional<Cursor> getCursor(String id) {