The internality flag is being defaulted to a single underscore character now. Can be overridden with "kafka_clusters_internalTopicPrefix" property.
Unable to delete topics with names beginning with an underscore
### Discussed in https://github.com/provectus/kafka-ui/discussions/2755

<div type='discussions-op-text'>

<sup>Originally posted by **nitin1677** October 14, 2022</sup>
Kafka UI Version: d149d26013a81e22e5d0c8b59db56ac0565b9e55 ( [d149d26](https://github.com/provectus/kafka-ui/commit/d149d26))


Remove topic options are disabled for topics, where topic-name starts with underscore (_). what are the options to enable delete for topics, where name starts with underscore (_).</div>
kafka-ui-api/src/main/java/com/provectus/kafka/ui/model/InternalTopic.java
kafka-ui-api/src/main/java/com/provectus/kafka/ui/model/InternalTopic.java
diff --git a/kafka-ui-api/src/main/java/com/provectus/kafka/ui/model/InternalTopic.java b/kafka-ui-api/src/main/java/com/provectus/kafka/ui/model/InternalTopic.java
index b669d0db414..a553165de4d 100644
--- a/kafka-ui-api/src/main/java/com/provectus/kafka/ui/model/InternalTopic.java
+++ b/kafka-ui-api/src/main/java/com/provectus/kafka/ui/model/InternalTopic.java
@@ -42,9 +42,7 @@ public static InternalTopic from(TopicDescription topicDescription,
                                    Metrics metrics,
                                    InternalLogDirStats logDirInfo) {
     var topic = InternalTopic.builder();
-    topic.internal(
-        topicDescription.isInternal() || topicDescription.name().startsWith("_")
-    );
+    topic.internal(topicDescription.isInternal());
     topic.name(topicDescription.name());
 
     List<InternalPartition> partitions = topicDescription.partitions().stream()
