Elasticsearch "blocked by: [FORBIDDEN/12/index read-only / allow delete (api)" error

solve.md

If u are getting below error while indexing:

{
  "error": {
    "root_cause": [
      {
        "type": "cluster_block_exception",
        "reason": "blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];"
      }
    ],
    "type": "cluster_block_exception",
    "reason": "blocked by: [FORBIDDEN/12/index read-only / allow delete (api)];"
  },
  "status": 403
}

This can be caused by disk space:

PUT index-name/_settings
{
  "index": {
    "blocks": {
      "read_only_allow_delete": "false"
    }
  }
}