Logstash output amazon es plugin version support

I see that filebeat 6.4 does not support adding tags and fields.

I believe I am limited to 6.4 because the plugin logstash-output-amazon_es is only up to version 6.

So my stack is:
filebeat 6.4.3
logstash 1:6.4.3-1
elasticsearch 6.4

I'm using AWS ElasticSearch service. So am I not going to be able to add tags and fields or is there something I'm missing here?