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Paste your cluster output

Paste _cluster/allocation/explain, _cluster/health, _cat/shards, _cat/nodes, _cat/indices, _cat/allocation or _cluster/stats and get plain-English findings, each with evidence, the cluster's own reason, a fix with your names filled in, and a check.

Runs entirely in your browser. Nothing you enter is sent anywhere.

1. Paste your cluster output

Paste the raw output of one or more of these APIs, from Kibana Dev Tools or curl. Each output is recognised by its columns or JSON keys, not by a label, so a request line above it is fine but not needed. Several outputs in one box are fine when separated by a blank line.

APIAccepted forms
_cluster/allocation/explainwith or without a body, with or without ?pretty
_cluster/health, _cat/healthJSON; text with or without ?v
_cat/shards?v, no headers (default columns), custom h= with ?v (names or aliases), ?format=json
_cat/nodes, _cat/indices, _cat/allocation?v with default or custom h= columns, ?format=json, human sizes or bytes=b
_cluster/statsJSON

For the fullest picture paste: GET _cluster/health, GET _cat/shards?v&h=index,shard,prirep,state,store,node,unassigned.reason, GET _cat/allocation?v, GET _cat/nodes?v&h=name,version,node.role,heap.percent,ram.percent,disk.used_percent, GET _cat/indices?v, and one GET _cluster/allocation/explain per unassigned index.

Thresholds used by the checks (editable)

Paste some output above, or load the example, to see findings.

This reads the outputs you paste. Sparced reads 81 endpoints in one pass, from a live cluster or a support diagnostic, and prints findings the same way. Run the full diagnostic.

Read with this tool

Fix Unassigned Shards in Elasticsearch with Allocation ExplainRead the allocation explain API decider by decider: same_shard, disk_threshold, filter, awareness, max_retry, node left. Find the cause and fix each one safely.Elasticsearch Red Cluster Runbook: Lost Primaries and RecoveryTriage order for a red Elasticsearch cluster: find lost primaries, then choose between waiting, allocate_stale_primary, allocate_empty_primary or a restore.Elasticsearch Shard Sizing: A Capacity Model for Shard CountsCompute shard size and count for time-series and search indices, read per-node shard limits, and fix oversharding with the exact APIs and the arithmetic shown.Elasticsearch Disk Watermarks, Flood Stage and Headroom PlanningHow the low, high and flood stage disk watermarks work, why indices go read_only_allow_delete, how max_headroom changes the math, and how much disk to plan.