Uninitialized constant logstash::Filters::Ruby::JSON Did you mean? LogStash::Filters::Json

as the topic, I was traped with this problem, I have tried serveral methods,but it still does not work at all. anybody ever met that like me ? below is my settings
if [tags][0] == "ad_api-logs" {
mutate {
add_field => { "[@metadata][logType]" => "nginx" }
json {
source => "message"
target => "jsonContent"
then use message & jsonContent. how can I solve this?

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