Failed to Modify the Elasticsearch Cluster Specifications

Symptom

I failed to modify the cluster specifications and an error message is displayed on the console.

Figure 1 CSS.0073 error

Figure 2 CSS.0011 error

Possible Causes

The current index replica count is 0, and the backend has intercepted the specification change request. You need to set the replica count first before performing the specification change operation. Otherwise, there is a risk of shard loss.

Solution

PUT /index/_settings
{
    "number_of_replicas" : 1 //Number of replicas
}