Logstash undefined method `bson_type' for #<BigDecimal

when i use logstash-mongodb-output plugin, my log data include floating number,then have this problem?who can help me?

This was a long standing problem that was fixed in the latest version of the plugin 2.0.3 - December 10, 2015
Can you try to update this specific plugin.

Great. I just tried. There's no problem. very thanks!