ELK is a system of 3 tools for data processing that can output fancy graphs and statistics.
The main part of the tool is logstash : it parses and imports data in the elasticsearch database. tweettxt.conf file is a logstash configuration file that says how to parse data.
Then data is kept by elasticsearch and can be used by kibana (via web browser) to create nice charts etc.
Run ./compose_elk.sh
. This script will install Logstash and Elasticsearch via Docker Compose then install and connect Kibana to Elasticsearch.