Cluster_block_exception - SERVICE_UNAVAILABLE/2/no master

Mine is a three node ES cluster running 2.3.2. I am using REST API's and carrying out bulk indexing. I see this response

{"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}

In the post, one of the member has mentioned that when a node joins master election triggers. Does the master election triggers every time a master eligible node joins or only when no master is present in the cluster currently ?

Also what might be other possible reasons one might encounter this issue

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