Error Codes
- HTTP 400: Bad Request
- HTTP 401: Authorization Required
- HTTP 403: Cluster Disabled
- HTTP 403: Cluster Read-only
- HTTP 403: Maintenance
- HTTP 404: Cluster Not Found
- HTTP 404: Index Not Found
- HTTP 413: Request Too Large
- HTTP 429: Too Many Requests
- HTTP 500: Internal Server Error
- HTTP 501: Not Implemented
- HTTP 502: Bad Gateway
- HTTP 503: Service Unavailable
- HTTP 504: Gateway Timeout