”Missing Converter‟ usually means that you are trying to load a database column with a datatype that is not supported, Logstash doesn't know how to represent the data with a Logstash data type.
If that error occurs within the input plugin you don't ever get an object with a field that you could convert because the code that would create your event object crashes. It seems like you are not alone, but I could not find a solution:
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