How to provide a simple input text message to logstash

I am following https://github.com/miguel-rodriguez/Docker-ELK-Alfresco-Monitoring and trying to monitor the alfresco logs on kibana.However the kibana is running on port 5601 and the status of kibana is green showing elastic search is connected to it.
So ryt now,I want to know if the elk stack inside the docker container is connected to each other.For this,I want to print simple text message on kibana.So,I want to know how to actually provide the input to logstash that can be processed by the elastic search and appears on the kibana.I mean ,in which file ,I which file I should write the input text message so that logstash can collect that message and passes it to elasticsearch which actually appears on the kibana

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