message: [BE] Fix case-sensitive search in broker's topics
diff: @@ -175,7 +175,7 @@ public class TopicsController extends AbstractController implements TopicsApi {
  List<InternalTopic> filtered = existingTopics.stream()
  .filter(topic -> !topic.isInternal()
  || showInternal != null && showInternal)
  - .filter(topic -> search == null || StringUtils.contains(topic.getName(), search))
  + .filter(topic -> search == null || StringUtils.containsIgnoreCase(topic.getName(), search))
  .sorted(comparator)
  .toList();
  var totalPages = (filtered.size() / pageSize)
  