Logstash got error message "no implicit conversion of nil into String"

Elastic Stack Logstash
1 
[2020-12-03T01:22:03,474][ERROR][logstash.outputs.elasticsearch] An unknown error occurred sending a bulk request to Elasticsearch. We will retry indefinitely {:error_message=>"no implicit conversion of nil into String", :error_class=>"TypeError",

i'm new to ELK here is the error message and error suddenly happened since last Monday, and Kibana did not make new indices

i used aws-elastic-search6.7 and logstash version 6.7

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