Elasticsearch cluster error for ES 7.2.1 "master not discovered yet:"

Hi Team, 

I am getting the below Warning in 1 of my data node. 
My configuration is 1 master and 1 data node but data node is not connecting with the master node.
ES Version- 7.2.1 

"Error:-    [o.e.c.c.ClusterFormationFailureHelper] [elastic-worker] master not discovered yet: have discovered []; discovery will continue using [x.x.x.25:9300] from hosts providers and [{elastic-worker}{vY2-JKGMQnCiO7xxosmvrw}{yDzLPkZqTmKqixDUz6s5_A}{localhost}{}{ml.machine_memory=33736433664, xpack.installed=true, ml.max_open_jobs=20}] from last-known cluster state; node term 0, last-accepted version 0 in term 0"

Anyone help me on this

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