What's means? [cloudoc1] value for setting "discovery.zen.minimum_master_nodes" is too low

Elastic Stack Elasticsearch
1

log

[2018-11-05T10:21:26,407][WARN ][o.e.d.z.ElectMasterService] [cloudoc1] value for setting "discovery.zen.minimum_master_nodes" is too low. This can result in data loss! Please set it to at least a quorum of master-eligible nodes (current value: [-1], total number of master-eligible nodes used for publishing in this round: [2])

** node1 elasticsearch.yml**
cluster.name: cloudocCluster
node.name: cloudoc1
network.host: 192.168.1.99
http.port: 9200
discovery.zen.ping.unicast.hosts: ["192.168.1.99"]

** node2 elasticsearch.yml**
cluster.name: cloudocCluster
node.name: cloudoc2
network.host: 192.168.1.99
http.port: 9400
discovery.zen.ping.unicast.hosts: ["192.168.1.99"]

2

Set:

discovery.zen.minimum_master_nodes: 2
3

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