Index Patterns Cannot Be Created for an Elasticsearch Cluster

Symptom

When I click Create index pattern on the Kibana console, nothing happens, so I cannot create an index pattern.

Possible Cause

1. Check whether the disk is full, which leads to the read-only state of the .kibana index.
2. Check whether there are multiple Kibana indexes.

Solution

PUT .kibana/_settings
{
  "index": {
    "blocks": {
      "read_only_allow_delete": "null"
    }
  }
}