message: remove cluster.initial_master_nodes it seems not be needed
diff: @@ -22,5 +22,4 @@ else
  sed -i 's/discovery.seed_hosts:.*//' /usr/share/elasticsearch/config/elasticsearch.yml
  sed -i 's/cluster.initial_master_nodes:.*//' /usr/share/elasticsearch/config/elasticsearch.yml
  echo "discovery.seed_hosts: ${K8S_SVC_NAME}" >> /usr/share/elasticsearch/config/elasticsearch.yml
  - echo "cluster.initial_master_nodes: ${K8S_SVC_NAME}-0" >> /usr/share/elasticsearch/config/elasticsearch.yml
  fi
  