Why has the Elasticsearch Zen Discovery been removed?

Graylog Central (peer support)
1

I updated from graylog2/server:2.2.3-1 to graylog/graylog:2.4.6-1

The logs is full of messages like this:
ERROR: org.graylog2.indexer.cluster.Cluster - Couldn’t read cluster health for indices [graylog_*] (Could not connect to http://127.0.0.1:9200)

In my docker-compose.yml I had a line like this:
GRAYLOG_ELASTICSEARCH_DISCOVERY_ZEN_PING_UNICAST_HOSTS: “graylog-es-01:9300,graylog-es-02:9300”

After some reading I figured out that elasticsearch_discovery_zen_ping_unicast_hosts is no longer supported:
https://github.com/Graylog2/graylog2-server/commit/4213a2257429b6a0803ab1b52c39a6a35fbde889#diff-ff769929a97ba53b83908b0eb76f1308

The GIT checkin comment is very brief: “Due to the differences in connecting to the Elasticsearch cluster, configuring Graylog has changed. These configuration settings have been removed”.

Why has the Elasticsearch Zen Discovery been removed?

2

the easiest way would be, read the documentation: http://docs.graylog.org/en/2.4/pages/upgrade.html

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