JDBC Logstash - Json datatype is unknown

Hello everyone,
I'm collecting the data from Postgresql table via Logstash. Postgre table contains text typed Json field. In the config file I filtered the json and I can see in the Kibana json keys separately but data types are seeing unknown. I tried the mutate and convert plugin but nothing has change. Can anybody help?
Thanks in advance...

Have you done an index pattern refresh in Kibana?

Thanks, I just solve it, first reason is what you mentioned and the second is some naming issue in the json keys.

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