Nifi to Elasticsearch via Filebeat module using PutTCP

[#1]

I am trying to use Nifi to send data via tcp to relevant filebeat modules, but I am finding that Nifi is adding unwanted data to the logs. Has anyone come across this problem if using Nifi to send to Elasticsearch before and if so, what might be a good solution to preventing Nifi from doing this? (separate pipeline in Elastic to drop/rename/add etc or to use Logstash from Nifi or add a new module to not pick up Nifi data...?)

[#2]

What processor are you using to send the data?