org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [SERVICE_UNAVAILABLE/1/state not recovered / initialized]

Hi, I'm using elasticsearch with graylog. I previously had elasticsearch 2, now I upgraded it to 5. I run it using docker-compose. I'm only using one instance. Here's the service definition:

      elasticsearch:
        restart: always
        image: "docker.elastic.co/elasticsearch/elasticsearch:5.6.3"
        command: "elasticsearch -Ecluster.name='graylog' -Expack.security.enabled=false"
        volumes:
          - /home/graylog/.elasticsearch:/usr/share/elasticsearch/data

Graylog's System Overview says everything is fine:

Elasticsearch cluster is green. Shards: 4 active, 0 initializing, 0 relocating, 0 unassigned,

However,

naftoli@graylog-main:/home/graylog$ curl 172.18.0.3:9200/_cat/health
1509412370 01:12:50 graylog yellow 1 1 9 9 0 0 5 0 - 64.3%
naftoli@graylog-main:/home/graylog$ curl 172.18.0.3:9200/_cat/nodes
172.18.0.3 10 64 8 0.08 0.43 0.66 mdi * 0bjKb6g

Here are the logs: https://gist.github.com/nafg/07b5c951b2566a37aec074c0f405da31

Note the ClusterBlockException.

How to proceed?

Thanks.

What is the problem you are looking to solve here?

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