Connection error (check network and/or proxy settings)- all nodes failed

spark配置auth后不能连接到es
错误信息：Connection error (check network and/or proxy settings)- all nodes failed; tried [[host1:9200]] 

new SparkConf()
 .set("es.nodes", elasticsearchHost)
 .set("es.port", elasticsearchPort)
.set("es.nodes.wan.only","true")
.set("es.net.http.auth.user", "username")  
.set("es.net.http.auth.pass", "password")
 
Java : 1.8
elasticsearch 7.0.0
scala 2.11
spark 2.4
hadoop 2.6.0