Last updated: November 11, 2026
Is ELK Stack down? User reports show problems with ELK Stack
The ELK Stack combines Elasticsearch, Logstash, and Kibana to collect, search, and display logs and metrics for engineering teams. This page tracks cluster outages, indexing failures, and the errors teams report most.
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ELK Stack uptime and reports
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Last 30 days, day by day: 12 October 2026 to 10 November 2026
Green: up. Red: outage. Amber: some checks failed. Grey: no record yet.
The daily record builds from today as our checks run. Grey days have no saved record yet. A red day marks a confirmed outage.
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Is ELK Stack Down Right Now?
The ELK Stack is a set of open tools for searching and viewing logs. Elasticsearch stores the data, Logstash or Beats collects and ships it, and Kibana draws the dashboards. Teams check the ELK Stack status when searches fail or dashboards stop loading.
Is ELK Stack down? The stack runs on your own servers or on a hosted cloud plan, so there is no single switch to check. A failure usually sits in one cluster, one node, or one pipeline. Reports here show if other teams see the same ELK Stack outage signs right now.
Is ELK Stack Down for Me or Everyone?
Ask what exactly fails. If Kibana loads but searches time out, Elasticsearch is struggling while the front end still works. If fresh logs stop arriving, the problem sits in Logstash, Beats, or the path between them. Code hosts log the same story, since a GitLab pipeline stall often starts with one tired storage service underneath.
Check cluster health first through the health API or your monitoring. Green means the data layer is fine and the fault is elsewhere. Yellow or red points at shard trouble on your own nodes. When only your cluster fails, it is a local fault, not an ELK Stack outage for everyone.
Why Is Elasticsearch Rejecting Writes with Circuit Breaker Errors?
Elasticsearch guards its memory with circuit breakers. When a request would push heap use past a safe limit, it refuses the request with a circuit_breaking_exception and a 429 response. Big aggregations and heavy indexing trigger this most often.
Check heap pressure on each node when these errors appear. Freeing memory, shrinking request sizes, or adding heap headroom calms the breaker. Repeated trips mean the cluster is undersized for its workload.
Why Has Kibana Stopped Loading Dashboards?
Kibana shows a loading screen or a server is not ready yet message when it cannot reach a healthy Elasticsearch. Migrations after an upgrade also hold Kibana back until they finish.
Restart order matters here. Bring Elasticsearch to green or yellow health first, then start Kibana. If dashboards load but spin forever, the data layer is answering too slowly. Check node CPU and heap before blaming the browser.
Why Are Logs Missing in Kibana?
Gaps in Kibana usually start upstream. A stopped Logstash, a crashed Beat, or a full disk on a shipping host cuts the flow quietly. The index pattern also matters, because a wrong time field hides fresh data that did arrive.
Work along the chain. Confirm the source app writes logs, the shipper runs, and the index grows. Disk watermarks can block new writes while old data still searches fine. That split confuses many teams during an incident.
Common ELK Stack Problems and Fixes
Cluster health shows red
Cluster health shows red: Red means at least one primary shard is missing. Find the unassigned shards and the reason through the allocation explain tools. A node that dropped out often rejoins and heals the cluster once it returns.
Indices stuck read-only
Indices stuck read-only: This follows the flood stage disk watermark, which fires near 95 percent disk use. Free space or add storage, then clear the read-only block on each index. On some setups the block lifts once space recovers.
Logstash restarts in a loop
Logstash restarts in a loop: A bad pipeline config or a dead output target usually causes the loop. Test the config before restart and read the first error in the log. One broken filter line can stop every pipeline on the host.
Kibana is not ready yet
Kibana is not ready yet: Elasticsearch is still starting, migrating, or unhealthy behind that message. Wait for cluster health to settle, then reload Kibana. A version mismatch between Kibana and Elasticsearch also blocks startup until both match.
Search returns 429 errors
Search returns 429 errors: Thread pools and circuit breakers reject work when the cluster is saturated. Reduce concurrent heavy searches and shrink aggregation sizes. Persistent rejections at quiet times mean nodes need more heap.
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Frequently Asked Questions
What does a circuit_breaking_exception mean in Elasticsearch?
It means Elasticsearch refused a request to protect its memory. The request would have pushed heap use past a safe limit. Smaller requests or more heap headroom stop the error.
Why is my Elasticsearch cluster health red?
Red means a primary shard is unassigned, so some data cannot be read. A lost node is the usual cause. Check shard allocation to find which index and node are affected.
How do I clear a read-only block on an index?
Free disk space first, because the block returns while the disk stays full. Then set the index read-only block to false through the index settings API. Writes resume right away.
Why does Kibana say the server is not ready yet?
Kibana waits for Elasticsearch to be reachable and healthy. Startup migrations after upgrades also show this message. Give the cluster a few minutes, then check its health endpoint.
What is the flood stage watermark in Elasticsearch?
It is the highest disk watermark, reached near 95 percent disk use. At that point Elasticsearch marks indices read-only to protect the node. Freeing space clears the state.
Why is Logstash not sending logs to Elasticsearch?
Check for a stopped pipeline, a full persistent queue, or a refused connection to the cluster. The Logstash log shows the first failure plainly. A disk-blocked cluster also rejects its writes.