Filebeat kafka output topic name always in lowercase?

when configure the kafka output topic, I configure the topic name in uppercase . but when start the filebeat it always create the lowercase topic in kafka and send message to that lowercase name topic. is this the filebeat issue or configuration error or default configuration ?
please help me ......

this issue is solved when I try to change the filebeat version from 7.7.1 to 7.12.0

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