AWS Elasticsearch Service and "Deflector exists as an index and is not an alias"

I am attempting to setup graylog 2.3.1 with AWS Elasticsearch service, but I keep getting “Deflector exists as an index and is not an alias” errors.
I stopped the graylog server and deleted the index without success. (as specified in Deflector exists as an index and is not an alias and Deflector exists as an index and is not an alias- graylog OVA 2.3) Any thoughts on what could be wrong?

System:
using the 2.3.1 AMI for graylog configured as server.
elasticsearch 5.5 cluster
Edit /opt/graylog/conf/graylog.conf setting the elasticsearch_hosts

looks like the problem was caused by

elasticsearch_discovery_enabled = true

changing to false fixed

elasticsearch_discovery_enabled = false

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