Get field usage stats Technical preview; Added in 7.15.0

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.

Required authorization

Index privileges: manage

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.

Supported values include:
- all: Match any data stream or index, including hidden ones.
- open: Match open, non-hidden indices. Also matches any non-hidden data stream.
- closed: Match closed, non-hidden indices. Also matches any non-hidden data stream. Data streams cannot be closed.
- hidden: Match hidden data streams and hidden indices. Must be combined with open, closed, or both.
- none: Wildcard expressions are not accepted.
Values are all, open, closed, hidden, or none.
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.

Responses

200 application/json
Hide response attribute Show response attribute object
- _shards object Required
  
  Hide _shards attributes Show _shards attributes object
  
  failed number Required
  
  The number of shards the operation or search attempted to run on but failed.
  
  successful number Required
  
  The number of shards the operation or search succeeded on.
  
  total number Required
  
  The number of shards the operation or search will run on overall.
  
  failures array[object]
  
  Hide failures attributes Show failures attributes object
  
  index string
  
  node string
  
  reason object Required
  
  Cause and details about a request failure. This class defines the properties common to all error types. Additional details are also provided, that depend on the error type.
  
  shard number
  
  status string
  
  primary boolean
  
  skipped number

GET /{index}/_field_usage_stats

GET /my-index-000001/_field_usage_stats

resp = client.indices.field_usage_stats(
    index="my-index-000001",
)

const response = await client.indices.fieldUsageStats({
  index: "my-index-000001",
});

response = client.indices.field_usage_stats(
  index: "my-index-000001"
)

$resp = $client->indices()->fieldUsageStats([
    "index" => "my-index-000001",
]);

curl -X GET -H "Authorization: ApiKey $ELASTIC_API_KEY" "$ELASTICSEARCH_URL/my-index-000001/_field_usage_stats"

client.indices().fieldUsageStats(f -> f
    .index("my-index-000001")
);

Response examples (200)

An abbreviated response from `GET /my-index-000001/_field_usage_stats`. The `all_fields` object reports the sums of the usage counts for all fields in the index (on the listed shard).

{
  "_shards": {
    "total": 1,
    "successful": 1,
    "failed": 0
  },
  "my-index-000001": {
    "shards": [
      {
        "tracking_id": "MpOl0QlTQ4SYYhEe6KgJoQ",
        "tracking_started_at_millis": 1625558985010,
        "routing": {
          "state": "STARTED",
          "primary": true,
          "node": "gA6KeeVzQkGURFCUyV-e8Q",
          "relocating_node": null
        },
        "stats": {
          "all_fields": {
            "any": "6",
            "inverted_index": {
              "terms": 1,
              "postings": 1,
              "proximity": 1,
              "positions": 0,
              "term_frequencies": 1,
              "offsets": 0,
              "payloads": 0
            },
            "stored_fields": 2,
            "doc_values": 1,
            "points": 0,
            "norms": 1,
            "term_vectors": 0,
            "knn_vectors": 0
          },
          "fields": {
            "_id": {
              "any": 1,
              "inverted_index": {
                "terms": 1,
                "postings": 1,
                "proximity": 1,
                "positions": 0,
                "term_frequencies": 1,
                "offsets": 0,
                "payloads": 0
              },
              "stored_fields": 1,
              "doc_values": 0,
              "points": 0,
              "norms": 0,
              "term_vectors": 0,
              "knn_vectors": 0
            },
            "_source": {},
            "context": {},
            "message.keyword": {}
          }
        }
      }
    ]
  }
}