Fails silently on records that don't match defined type

[azimut]

I suspect this is an intended behaviour. But a warning might help.

My use case is that I had a "double" field that could be missing (latitude,longitude). And this was dropping the records. I set it to string to workaround this for testing.

[sasakitoa]

Thank you for comment @azimut, and sorry for late reply.
In my environment, double field of key and value were handled correctly, and I couldn't reproduce.

Do you set key_deserializer and value_deserializer correctly?
This plugin will detect key and value type with deserializer class.