logstash从kafka取数往ES集群写入时候报错

[leeing227]

我现在集群每天的日志量大概3T，55个节点，50个data node，2个client节点，3个master节点，用kafka做了缓冲，但是logstash从kafka取数写入到es的时候，总是有报错："Attempted to send a bulk request to Elasticsearch configured at 、but an error occurred and it failed! Are you sure you can reach elasticsearch from this machine using the configuration provided?",、error_message=>"[503] {\"error\":{\"root_cause\":[{\"type\":\"cluster_block_exception\",\"reason\":\"blocked by: [SERVICE_UNAVAILABLE/2/no master];\"}],\"type\":\"cluster_block_exception\",\"reason\":\"blocked by: [SERVICE_UNAVAILABLE/2/no master];\"},\"status\":503}"

我的output配置的hosts=[这里配置了部分节点]，看报错说是这个配置有问题，
不知道什么原因，大神们能帮忙看看吗？