Elasticsearch cluster unexpected failure for few minutes when one node down

I have created ES-lab with 3master,2client and 2 datanode. All request is routed through client node.
I have found during indexing if one of my datanode goes down, my entire cluster will get unavailable for 1-2 minutes.
I believe this is because of primary shard belongs to indexing index was also unavailable with the same node.

If I am right then can we make any improvement to minimize such downtime ?

Which version of Elasticsearch are you using? Do you have a replica configured for your indices? How many indices and shards do you have in the cluster?

ES version: 6.2.2
replica: 1
index: 40
shards: 4 shards for each index

What is in the Elasticsearch logs?

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