Filter ruby exception occurred with no message

Elastic Stack Logstash
1

I encountered same issue with Ruby exception with no message.

following is logstash log info.

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image1815×237 25.7 KB

following is configuration info.

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image1850×374 13.7 KB

When I get output, the "index_postfix" can not be parsed as a variable.
following is output event es_index field:
"es_index":"tmcas_statistics_%{index_postfix}"

This problem is happened after I restart logstash, but sometimes it works, sometimes it returns ruby exception.

logstash version is 6.2.3.
Anyone can help ? Many thanks!

2

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