Primary shard is not active Timeout: [1m]

I have got a single node(unix machine) where we have setup ELK 6.8.6. However while sending the logs from logstash to elasticsearch I am getting following exception s repeatedly.

[2020-10-22T13:59:23,500][INFO ][logstash.outputs.elasticsearch] Retrying individual bulk actions that failed or were rejected by the previous bulk request. {:count=>3}

[2020-10-22T14:00:29,193][INFO ][logstash.outputs.elasticsearch] retrying failed action with response code: 503 ({"type"=>"unavailable_shards_exception", "reason"=>"[test][3] primary shard is not active Timeout: [1m], request: [BulkShardRequest [[test][3]] containing [index {[test][doc][34JRHCJDJSJEDK], source[{\"@version\":\"1\",\"@timestamp\":\"2020-10-22T13:07:44.066Z\",\"messa

What could be the possible root cause of this error ? I got other reference of the same error here but they are not related to 503 error in logs.


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