Get field usage stats | Elasticsearch API documentation (v8)

Get field usage stats Technical preview

GET /{index}/_field_usage_stats

Get field usage information for each shard and field of an index. Field usage statistics are automatically captured when queries are running on a cluster. A shard-level search request that accesses a given field, even if multiple times during that request, is counted as a single use.

The response body reports the per-shard usage count of the data structures that back the fields in the index. A given request will increment each count by a maximum value of 1, even if the request accesses the same field multiple times.

Path parameters

index string | array[string] Required

Comma-separated list or wildcard expression of index names used to limit the request.

Query parameters

allow_no_indices boolean

If false, the request returns an error if any wildcard expression, index alias, or _all value targets only missing or closed indices. This behavior applies even if the request targets other open indices. For example, a request targeting foo*,bar* returns an error if an index starts with foo but no index starts with bar.
expand_wildcards string | array[string]

Type of index that wildcard patterns can match. If the request can target data streams, this argument determines whether wildcard expressions match hidden data streams. Supports comma-separated values, such as open,hidden.
ignore_unavailable boolean

If true, missing or closed indices are not included in the response.
fields string | array[string]

Comma-separated list or wildcard expressions of fields to include in the statistics.
master_timeout string

Period to wait for a connection to the master node. If no response is received before the timeout expires, the request fails and returns an error.
timeout string

Period to wait for a response. If no response is received before the timeout expires, the request fails and returns an error.
wait_for_active_shards number | string

The number of shard copies that must be active before proceeding with the operation. Set to all or any positive integer up to the total number of shards in the index (number_of_replicas+1).

Responses

200 application/json
Hide response attribute Show response attribute object
- _shards object Required
  
  Hide _shards attributes Show _shards attributes object
  
  failed number Required
  
  successful number Required
  
  total number Required
  
  failures array[object]
  
  Hide failures attributes Show failures attributes object
  
  index string
  
  node string
  
  reason object Required
  
  Hide reason attributes Show reason attributes object
  
  type string Required
  
  The type of error
  
  reason string
  
  A human-readable explanation of the error, in English.
  
  stack_trace string
  
  The server stack trace. Present only if the error_trace=true parameter was sent with the request.
  
  caused_by object
  
  root_cause array[object]
  
  suppressed array[object]
  
  shard number Required
  
  status string
  
  skipped number

GET /{index}/_field_usage_stats

curl \
 --request GET http://api.example.com/{index}/_field_usage_stats \
 --header "Authorization: $API_KEY"

Response examples (200)

{
  "_shards": {
    "failed": 42.0,
    "successful": 42.0,
    "total": 42.0,
    "failures": [
      {
        "index": "string",
        "node": "string",
        "reason": {
          "type": "string",
          "reason": "string",
          "stack_trace": "string",
          "caused_by": {},
          "root_cause": [
            {}
          ],
          "suppressed": [
            {}
          ]
        },
        "shard": 42.0,
        "status": "string"
      }
    ],
    "skipped": 42.0
  }
}