Is the first time I use Kibana so I'm a bit lost. I'm trying to complete an assignment for university. I have to specify which sources are the tweets coming from. In logstash I configurated full_tweet and my APIs, but when I create my Pie chart, I have no idea how to show from where they are coming. As you can see in the picture below, it's not showing the name properly. Any help for a rookie, please?