Unable to create an Index Pattern, pattern creation hanging up or failing

Elastic Stack Kibana
9

This issue was being caused because the indices were locked because of low disk space and was evident by running a GET .kibana/_settings and seeing a response similar to the following:

{
  ".kibana_2" : {
    "settings" : {
      "index" : {
        "number_of_shards" : "1",
        "auto_expand_replicas" : "0-1",
        "blocks" : {
          "read_only_allow_delete" : "true"
        },
        "provided_name" : ".kibana_1",
        "creation_date" : "154192928788386",
        "number_of_replicas" : "1",
        "uuid" : "giheoigheo028r02810",
        "version" : {
          "created" : "6050499"
        }
      }
    }
  }
}

after freeing up disk space, you can do the following to unlock the .kibana index:

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

https://www.elastic.co/guide/en/elasticsearch/reference/7.0/disk-allocator.html#disk-allocator has more details

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