Elastic connection ERROR -> Elasticsearch 6 + Kibana + Docker Compose - docker

Question

Below is my docker.compose.yml.
After executing it, it shows:
kibana | {"type":"log","#timestamp":"2018-04-24T18:27:43Z","tags":["warning","elasticsearch","admin"],"pid":1,"message":"Unable to revive connection: http://localhost:9200/"}
kibana | {"type":"log","#timestamp":"2018-04-24T18:27:43Z","tags":["warning","elasticsearch","admin"],"pid":1,"message":"No living connections"}
I believe the problem might be related to the platinum release of elasticsearch I am excuting, related to the fact I might not be setting the right parameters to use it with Xpath.
Am I forgetting to set up anything to make platinum work?
I tried even going to kitematic and linking manually Kibana to Elasticsearch container but the same problem continues.
Nothing that I tried worked. How can I fix this?
version: '2.2'
services:
elasticsearch:
image: docker.elastic.co/elasticsearch/elasticsearch-platinum:6.2.4
container_name: elasticsearch
environment:
- ELASTICSEARCH_USERNAME=elastic
- ELASTICSEARCH_PASSWORD=MagicWord
- cluster.name=docker-cluster
- bootstrap.memory_lock=true
- "ES_JAVA_OPTS=-Xms512m -Xmx512m"
ulimits:
memlock:
soft: -1
hard: -1
volumes:
- esdata1:/usr/share/elasticsearch/data
ports:
- 9200:9200
networks:
- esnet
elasticsearch2:
image: docker.elastic.co/elasticsearch/elasticsearch-platinum:6.2.4
container_name: elasticsearch2
environment:
- ELASTICSEARCH_USERNAME=elastic
- ELASTICSEARCH_PASSWORD=MagicWord
- cluster.name=docker-cluster
- bootstrap.memory_lock=true
- "ES_JAVA_OPTS=-Xms512m -Xmx512m"
- "discovery.zen.ping.unicast.hosts=elasticsearch"
ulimits:
memlock:
soft: -1
hard: -1
volumes:
- esdata2:/usr/share/elasticsearch/data
networks:
- esnet
kibana:
image: docker.elastic.co/kibana/kibana:6.2.4
container_name: kibana
environment:
- ELASTICSEARCH_URL="http://localhost:9200"
- ELASTICSEARCH_USERNAME=elastic
- ELASTICSEARCH_PASSWORD=MagicWord
- "xpack.monitoring.ui.container.elasticsearch.enabled=true"
ports:
- 5601:5601
networks:
- esnet
depends_on:
- elasticsearch
volumes:
esdata1:
driver: local
esdata2:
driver: local
networks:
esnet:
Anyone can help?