Elasticsearch和Kibana，创建了数千个文档我不知道为什么和连接增加

I'm actually testing Elasticsearch and Kibana (last versions) with the official Docker images. Everything is up and running and I have indexed only one document. The problem is when I take a look to the monitoring section in Kibana, apparently there is thousands of documents (each seconds dozen are created) and Kibana connections keep increasing (1972 on the screen capture). All these documents are logs? Why there is so many and what about these connections? I'm actually a bit scaried to use it in production since I don't find any information about it.I'm actually testing Elasticsearch and Kibana (