expression language not working in nifi update attribute

[#1]

iam trying to publish data into multiple kafka topics with some conditions but instead of returning value of the expression , whole value passed for the property is coming.

customerTopic should return me the value of the expression but its returning the expression itself

attaching the images of the flow.

[#2 · Accepted solution]

Try that value:

${kafka.topic:contains('alerts'):ifElse('customerTopicKafkaTesting1',${kafka.topic:contains('events'):ifElse('customerTopicKafkaTesting2',${kafka.topic:contains('ack'):ifElse('customerTopicKafkaTesting3','Not_Found')})})}

You forgot to close ${kafka.topic:contains('events')...}