Get field usage stats Technical preview; Added in 7.15.0

GET /{index}/_field_usage_stats
Api key auth Basic auth Bearer auth

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

    A setting that does two separate checks on the index expression. If false, the request returns an error (1) if any wildcard expression (including _all and *) resolves to zero matching indices or (2) if the complete set of resolved indices, aliases or data streams is empty after all expressions are evaluated. If true, index expressions that resolve to no indices are allowed and the request returns an empty result.

  • 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 false, the request returns an error if it targets a concrete (non-wildcarded) index, alias, or data stream that is missing, closed, or otherwise unavailable. If true, unavailable concrete targets are silently ignored.

  • 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": {}
          }
        }
      }
    ]
  }
}