How to stop Logstash from processing logs

Elastic Stack Logstash
1

A few GB of data was sent to logstash and I now want to stop the processing of that data. Is there a way to do so? I've tried restarting and also deleting the index but after about 15 secs its starts to process the data and it shows in Kibana.

2

A few GB of data was sent to logstash

From where?

3

filebeat

4

So... make Filebeat stop sending data by shutting it down or reconfiguring it?