How to add a new node to my Elasticsearch cluster

Question

My cluster has a yellow health as it has only one single node, so the replicas remain unasigned simply because no other node is available to contain them.

Answer 1

If you are running Elasticsearch n local just go to another terminal and run elasticsearch again. This way you will have two instance.

You will see following message on the newly run instance:

[Black Widow] detected_master [N'Garai]

On Already running instance(master node)

[N'Garai] added {[Black Widow]

Assuming [N'Garai] and {[Black Widow] to be random node names.