How to fix cluster health yellow with Elastic Search

Question

I have setup on server, with MongoDb and ElasticSearch. Using https://github.com/richardwilly98/elasticsearch-river-mongodb I have connected ElasticSearch and MongoDb together.<

Answer 1

I am posting an answer since I tumbled upon this question while looking for solution of similar issue.

I have a dev environment where I need only 1 Elasticsearch node so there is no need for replicas for all my indices.

To solve cluster health: yellow issue, I just made index.number_of_replicas: 1

PUT /_settings
{
  "index" : {
        "number_of_replicas" : 0
    }
}