Cluster_block_exception: blocked by: [SERVICE_UNAVAILABLE/2/no master]

I am seeing the following error on a 2x cluster with three master eligible nodes.

EXCEPTION: 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}

Can someone please help me understand this exception?

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