Elasticsearch / OpenSearch

Cluster health, indices and shards, searching, mappings and reindexing — via the REST API with curl.

Cluster

Cluster health

curl -s '<es>/_cluster/health?pretty'

Nodes with load and disk

curl -s '<es>/_cat/nodes?v&h=name,cpu,load_1m,heap.percent,disk.used_percent,node.role'

Disk allocation per node

curl -s '<es>/_cat/allocation?v'

Why a shard is unassignedadvanced

curl -s '<es>/_cluster/allocation/explain?pretty'

Indices

List indices sorted by size

curl -s '<es>/_cat/indices?v&s=store.size:desc'

Shards of an index

curl -s '<es>/_cat/shards/<index>?v'

Index mapping

curl -s '<es>/<index>/_mapping?pretty'

Delete an index

curl -X DELETE '<es>/<index>'

Aliases

curl -s '<es>/_cat/aliases?v'

Search

Quick search with query string

curl -s '<es>/<index>/_search?q=status:error&size=5&pretty'

Count documents

curl -s '<es>/<index>/_count?pretty'

Search with a JSON query

curl -s '<es>/<index>/_search?pretty' -H 'Content-Type: application/json' -d '
{
  "query": { "match": { "message": "timeout" } },
  "size": 10,
  "sort": [{ "@timestamp": "desc" }]
}'

Get a document by id

curl -s '<es>/<index>/_doc/<id>?pretty'

Maintenance

Copy data into a new indexadvanced

curl -X POST '<es>/_reindex?wait_for_completion=false' -H 'Content-Type: application/json' -d '
{ "source": { "index": "<index>" }, "dest": { "index": "<index>-v2" } }'

Running tasks (e.g. reindex progress)advanced

curl -s '<es>/_tasks?actions=*reindex&detailed&pretty'

Unblock indices after the disk filled upadvanced

curl -X PUT '<es>/_all/_settings' -H 'Content-Type: application/json' \
  -d '{ "index.blocks.read_only_allow_delete": null }'