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EQL search API

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EQL search API

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Returns search results for an Event Query Language (EQL) query.

EQL assumes each document in a data stream or index corresponds to an event.

GET /my-data-stream/_eql/search
{
  "query": """
    process where process.name == "regsvr32.exe"
  """
}

Request

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GET /<target>/_eql/search

POST /<target>/_eql/search

Prerequisites

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If the Elasticsearch security features are enabled, you must have the read index privilege for the target data stream, index, or alias.
See Required fields.
[preview] This functionality is in technical preview and may be changed or removed in a future release. Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features. For cross-cluster search, the local and remote clusters must use the same Elasticsearch version. For security, see Configure remote clusters with security.

Limitations

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See EQL limitations.

Path parameters

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<target>

(Required, string) Comma-separated list of data streams, indices, or aliases used to limit the request. Supports wildcards (*). To search all data streams and indices, use * or _all.

[preview] This functionality is in technical preview and may be changed or removed in a future release. Elastic will work to fix any issues, but features in technical preview are not subject to the support SLA of official GA features. To search a remote cluster, use the <cluster>:<target> syntax. See Run an EQL search across clusters.

Query parameters

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allow_no_indices

(Optional, Boolean)

This parameter’s behavior differs from the allow_no_indices parameter used in other multi-target APIs.

If false, the request returns an error if any wildcard pattern, 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.

If true, only requests that exclusively target missing or closed indices return an error. For example, a request targeting foo*,bar* does not return an error if an index starts with foo but no index starts with bar. However, a request that targets only bar* still returns an error.

Defaults to true.

ccs_minimize_roundtrips

(Optional, Boolean) If true, network round-trips between the local and the remote cluster are minimized when running cross-cluster search (CCS) requests.

This option is effective for requests that target data fully contained in one remote cluster; when data is spread across multiple clusters, the setting is ignored.

Defaults to true.

expand_wildcards

(Optional, 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. Valid values are:

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 patterns are not accepted.

Defaults to open.

filter_path

(Optional, string) Comma-separated list of filters for the API response. See Response Filtering.

ignore_unavailable

(Optional, Boolean) If false, the request returns an error if it targets a missing or closed index. Defaults to true.

keep_alive

(Optional, time value) Period for which the search and its results are stored on the cluster. Defaults to 5d (five days).

When this period expires, the search and its results are deleted, even if the search is still ongoing.

If the keep_on_completion parameter is false, Elasticsearch only stores async searches that do not complete within the period set by the wait_for_completion_timeout parameter, regardless of this value.

You can also specify this value using the keep_alive request body parameter. If both parameters are specified, only the query parameter is used.

keep_on_completion

(Optional, Boolean) If true, the search and its results are stored on the cluster.

If false, the search and its results are stored on the cluster only if the request does not complete during the period set by the wait_for_completion_timeout parameter. Defaults to false.

You can also specify this value using the keep_on_completion request body parameter. If both parameters are specified, only the query parameter is used.

wait_for_completion_timeout

(Optional, time value) Timeout duration to wait for the request to finish. Defaults to no timeout, meaning the request waits for complete search results.

If this parameter is specified and the request completes during this period, complete search results are returned.

If the request does not complete during this period, the search becomes an async search.

You can also specify this value using the wait_for_completion_timeout request body parameter. If both parameters are specified, only the query parameter is used.

Request body

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event_category_field

(Required*, string) Field containing the event classification, such as process, file, or network.

Defaults to event.category, as defined in the Elastic Common Schema (ECS). If a data stream or index does not contain the event.category field, this value is required.

The event category field must be mapped as a field type in the keyword family.

fetch_size

(Optional, integer) Maximum number of events to search at a time for sequence queries. Defaults to 1000.

This value must be greater than 2 but cannot exceed the value of the index.max_result_window setting, which defaults to 10000.

Internally, a sequence query fetches and paginates sets of events to search for matches. This parameter controls the size of those sets. This parameter does not limit the total number of events searched or the number of matching events returned.

A greater fetch_size value often increases search speed but uses more memory.

fields

(Optional, array of strings and objects) Array of field patterns. The request returns values for field names matching these patterns in the hits.fields property of the response.

You can specify items in the array as a string or object. See The fields option.

Properties of fields objects

field

(Required, string) Field to return. Supports wildcards (*).

format

(Optional, string) Format for date and geospatial fields. Other field data types do not support this parameter.

date and date_nanos fields accept a date format. geo_point and geo_shape fields accept:

geojson (default)

GeoJSON

wkt

Well Known Text

mvt(<zoom>/<x>/<y>@<extent>) or mvt(<zoom>/<x>/<y>)

Binary Mapbox vector tile. The API returns the tile as a base64-encoded string.

mvt parameters

<zoom>: (Required, integer) Zoom level for the tile. Accepts 0-29.
<x>: (Required, integer) X coordinate for the tile.
<y>: (Required, integer) Y coordinate for the tile.
<extent>: (Optional, integer) Size, in pixels, of a side of the tile. Vector tiles are square with equal sides. Defaults to 4096.

filter

(Optional, Query DSL object) Query, written in Query DSL, used to filter the events on which the EQL query runs.

keep_alive

(Optional, time value) Period for which the search and its results are stored on the cluster. Defaults to 5d (five days).

When this period expires, the search and its results are deleted, even if the search is still ongoing.

You can also specify this value using the keep_alive query parameter. If both parameters are specified, only the query parameter is used.

keep_on_completion

(Optional, Boolean) If true, the search and its results are stored on the cluster.

If false, the search and its results are stored on the cluster only if the request does not complete during the period set by the wait_for_completion_timeout parameter. Defaults to false.

You can also specify this value using the keep_on_completion query parameter. If both parameters are specified, only the query parameter is used.

query

(Required, string) EQL query you wish to run.

result_position

(Optional, enum) Set of matching events or sequences to return.

Valid values for result_position

tail: (Default) Return the most recent matches, similar to the Unix tail command.
head: Return the earliest matches, similar to the Unix head command.

This parameter may change the set of returned hits. However, it does not change the sort order of hits in the response.

runtime_mappings

(Optional, object of objects) Defines one or more runtime fields in the search request. These fields take precedence over mapped fields with the same name.

Properties of runtime_mappings objects

<field-name>

(Required, object) Configuration for the runtime field. The key is the field name.

Properties of <field-name>

type

(Required, string) Field type, which can be any of the following:

boolean
composite
date
double
geo_point
ip
keyword
long

script

(Optional, string) Painless script executed at query time. The script has access to the entire context of a document, including the original _source and any mapped fields plus their values.

This script must include emit to return calculated values. For example:

"script": "emit(doc['@timestamp'].value.dayOfWeekEnum.toString())"

size

(Optional, integer or float) For basic queries, the maximum number of matching events to return.

For sequence queries, the maximum number of matching sequences to return.

Defaults to 10. This value must be greater than 0.

You cannot use pipes, such as head or tail, to exceed this value.

tiebreaker_field: (Optional, string) Field used to sort hits with the same timestamp in ascending order. See Specify a sort tiebreaker.

timestamp_field

(Required*, string) Field containing event timestamp.

Defaults to @timestamp, as defined in the Elastic Common Schema (ECS). If a data stream or index does not contain the @timestamp field, this value is required.

Events in the API response are sorted by this field’s value, converted to milliseconds since the Unix epoch, in ascending order.

The timestamp field should be mapped as a date. The date_nanos field type is not supported.

wait_for_completion_timeout

(Optional, time value) Timeout duration to wait for the request to finish. Defaults to no timeout, meaning the request waits for complete search results.

If this parameter is specified and the request completes during this period, complete search results are returned.

If the request does not complete during this period, the search becomes an async search.

You can also specify this value using the wait_for_completion_timeout query parameter. If both parameters are specified, only the query parameter is used.

Response body

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id

(string) Identifier for the search.

This search ID is only provided if one of the following conditions is met:

A search request does not return complete results during the wait_for_completion_timeout parameter’s timeout period, becoming an async search.
The search request’s keep_on_completion parameter is true.

You can use this ID with the get async EQL search API to get the current status and available results for the search or get async EQL status API to get only the current status.

is_partial

(Boolean) If true, the response does not contain complete search results.

is_running

(Boolean) If true, the search request is still executing.

If this parameter and the is_partial parameter are true, the search is an ongoing async search. If the keep_alive period does not pass, the complete search results will be available when the search completes.

If is_partial is true but is_running is false, the search returned partial results due to a failure. Only some shards returned results or the node coordinating the search failed.

took

(integer) Milliseconds it took Elasticsearch to execute the request.

This value is calculated by measuring the time elapsed between receipt of a request on the coordinating node and the time at which the coordinating node is ready to send the response.

Took time includes:

Communication time between the coordinating node and data nodes
Time the request spends in the search thread pool, queued for execution
Actual execution time

Took time does not include:

Time needed to send the request to Elasticsearch
Time needed to serialize the JSON response
Time needed to send the response to a client

timed_out

(Boolean) If true, the request timed out before completion.

hits

(object) Contains matching events and sequences. Also contains related metadata.

Properties of hits

total

(object) Metadata about the number of matching events or sequences.

Properties of total

value

(integer) For basic queries, the total number of matching events.

For sequence queries, the total number of matching sequences.

relation

(string) Indicates whether the number of events or sequences returned is accurate or a lower bound.

Returned values are:

eq: Accurate
gte: Lower bound, including returned events or sequences

sequences

(array of objects) Contains event sequences matching the query. Each object represents a matching sequence. This parameter is only returned for EQL queries containing a sequence.

Properties of sequences objects

join_keys

(array of values) Shared field values used to constrain matches in the sequence. These are defined using the by keyword in the EQL query syntax.

events

(array of objects) Contains events matching the query. Each object represents a matching event.

Properties of events objects

_index: (string) Name of the index containing the event.
_id: (string) Unique identifier for the event. This ID is only unique within the index.
_source: (object) Original JSON body passed for the event at index time.

events

(array of objects) Contains events matching the query. Each object represents a matching event.

Properties of events objects

_index: (string) Name of the index containing the event.
_id: (string) (string) Unique identifier for the event. This ID is only unique within the index.
_source: (object) Original JSON body passed for the event at index time.

Examples

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Basic query example

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The following EQL search request searches for events with an event.category of process that meet the following conditions:

A process.name of cmd.exe
An process.pid other than 2013

GET /my-data-stream/_eql/search
{
  "query": """
    process where (process.name == "cmd.exe" and process.pid != 2013)
  """
}

The API returns the following response. Matching events in the hits.events property are sorted by timestamp, converted to milliseconds since the Unix epoch, in ascending order.

If two or more events share the same timestamp, the tiebreaker_field field is used to sort the events in ascending order.

{
  "is_partial": false,
  "is_running": false,
  "took": 6,
  "timed_out": false,
  "hits": {
    "total": {
      "value": 2,
      "relation": "eq"
    },
    "events": [
      {
        "_index": ".ds-my-data-stream-2099.12.07-000001",
        "_id": "babI3XMBI9IjHuIqU0S_",
        "_source": {
          "@timestamp": "2099-12-06T11:04:05.000Z",
          "event": {
            "category": "process",
            "id": "edwCRnyD",
            "sequence": 1
          },
          "process": {
            "pid": 2012,
            "name": "cmd.exe",
            "executable": "C:\\Windows\\System32\\cmd.exe"
          }
        }
      },
      {
        "_index": ".ds-my-data-stream-2099.12.07-000001",
        "_id": "b6bI3XMBI9IjHuIqU0S_",
        "_source": {
          "@timestamp": "2099-12-07T11:06:07.000Z",
          "event": {
            "category": "process",
            "id": "cMyt5SZ2",
            "sequence": 3
          },
          "process": {
            "pid": 2012,
            "name": "cmd.exe",
            "executable": "C:\\Windows\\System32\\cmd.exe"
          }
        }
      }
    ]
  }
}

Sequence query example

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The following EQL search request matches a sequence of events that:

Start with an event with:
- An event.category of file
- A file.name of cmd.exe
- An process.pid other than 2013
Followed by an event with:
- An event.category of process
- A process.executable that contains the substring regsvr32

These events must also share the same process.pid value.

GET /my-data-stream/_eql/search
{
  "query": """
    sequence by process.pid
      [ file where file.name == "cmd.exe" and process.pid != 2013 ]
      [ process where stringContains(process.executable, "regsvr32") ]
  """
}

The API returns the following response. Matching sequences are included in the hits.sequences property. The hits.sequences.join_keys property contains the shared process.pid value for each matching event.

{
  "is_partial": false,
  "is_running": false,
  "took": 6,
  "timed_out": false,
  "hits": {
    "total": {
      "value": 1,
      "relation": "eq"
    },
    "sequences": [
      {
        "join_keys": [
          2012
        ],
        "events": [
          {
            "_index": ".ds-my-data-stream-2099.12.07-000001",
            "_id": "AtOJ4UjUBAAx3XR5kcCM",
            "_source": {
              "@timestamp": "2099-12-06T11:04:07.000Z",
              "event": {
                "category": "file",
                "id": "dGCHwoeS",
                "sequence": 2
              },
              "file": {
                "accessed": "2099-12-07T11:07:08.000Z",
                "name": "cmd.exe",
                "path": "C:\\Windows\\System32\\cmd.exe",
                "type": "file",
                "size": 16384
              },
              "process": {
                "pid": 2012,
                "name": "cmd.exe",
                "executable": "C:\\Windows\\System32\\cmd.exe"
              }
            }
          },
          {
            "_index": ".ds-my-data-stream-2099.12.07-000001",
            "_id": "OQmfCaduce8zoHT93o4H",
            "_source": {
              "@timestamp": "2099-12-07T11:07:09.000Z",
              "event": {
                "category": "process",
                "id": "aR3NWVOs",
                "sequence": 4
              },
              "process": {
                "pid": 2012,
                "name": "regsvr32.exe",
                "command_line": "regsvr32.exe  /s /u /i:https://...RegSvr32.sct scrobj.dll",
                "executable": "C:\\Windows\\System32\\regsvr32.exe"
              }
            }
          }
        ]
      }
    ]
  }
}

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