# Kibana server is not ready
**URL:** https://discuss.elastic.co/t/kibana-server-is-not-ready/300432
**Category:** Kibana
**Created:** [March 23, 2022, 9:44am UTC](https://discuss.elastic.co/t/kibana-server-is-not-ready/300432 "2022-03-23T09:44:53Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@tharunkumar](https://discuss.elastic.co/u/tharunkumar)
#### Post date: [March 23, 2022, 9:44am UTC](https://discuss.elastic.co/t/kibana-server-is-not-ready/300432/1 "2022-03-23T09:44:53Z")
Hi i am using kibana 7.12.0. i am facing this issue frequently.can please help me with a solution
[FATAL Error: Unable to complete saved object migrations for the [.kibana] index. Please check the health of your Elasticsearch cluster and try again. Error: [cluster\_block\_exception]: index [.kibana\_7.12.0\_001] blocked by: [TOO\_MANY\_REQUESTS/12/disk usage exceeded flood-stage watermark, index has read-only-allow-delete block]; ]
---
### Author:  [@lusynda](https://discuss.elastic.co/u/lusynda)
#### Post date: [March 23, 2022, 10:06am UTC](https://discuss.elastic.co/t/kibana-server-is-not-ready/300432/2 "2022-03-23T10:06:55Z")
One of your data node has exceed its size campacity.
Default to elastic i thinks the flood gate is 95%
You can fix this by ussing the api to change the flood gate to higher %.
```auto
PUT /_cluster/settings
{
"persistent" : {
"cluster.routing.allocation.disk.watermark.flood_stage" : "96%"
}
}
```
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [April 20, 2022, 10:07am UTC](https://discuss.elastic.co/t/kibana-server-is-not-ready/300432/3 "2022-04-20T10:07:50Z")
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