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- Elasticsearch version 7.10.2
- Elasticsearch version 7.10.1
- Elasticsearch version 7.10.0
- Elasticsearch version 7.9.3
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- Elasticsearch version 7.9.1
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- Dependencies and versions
Update datafeeds API
editUpdate datafeeds API
editUpdates certain properties of a datafeed.
Request
editPOST _ml/datafeeds/<feed_id>/_update
Prerequisites
edit-
If Elasticsearch security features are enabled, you must have
manage_ml
, ormanage
cluster privileges to use this API. See Security privileges and Machine learning security privileges.
Description
editIf you update a datafeed property, you must stop and start the datafeed for the change to be applied.
When Elasticsearch security features are enabled, your datafeed remembers which roles the user who updated it had at the time of update and runs the query using those same roles. If you provide secondary authorization headers, those credentials are used instead.
Path parameters
edit-
<feed_id>
- (Required, string) A numerical character string that uniquely identifies the datafeed. This identifier can contain lowercase alphanumeric characters (a-z and 0-9), hyphens, and underscores. It must start and end with alphanumeric characters.
Request body
editThe following properties can be updated after the datafeed is created:
-
aggregations
- (Optional, object) If set, the datafeed performs aggregation searches. Support for aggregations is limited and should be used only with low cardinality data. For more information, see Aggregating data for faster performance.
-
chunking_config
-
(Optional, object) Datafeeds might be required to search over long time periods, for several months or years. This search is split into time chunks in order to ensure the load on Elasticsearch is managed. Chunking configuration controls how the size of these time chunks are calculated and is an advanced configuration option.
Properties of
chunking_config
-
mode
-
(string) There are three available modes:
-
auto
: The chunk size is dynamically calculated. This is the default and recommended value when the datafeed does not use aggregations. -
manual
: Chunking is applied according to the specifiedtime_span
. Use this mode when the datafeed uses aggregations. -
off
: No chunking is applied.
-
-
time_span
-
(time units)
The time span that each search will be querying. This setting is only applicable
when the mode is set to
manual
. For example:3h
.
-
-
delayed_data_check_config
-
(Optional, object) Specifies whether the datafeed checks for missing data and the size of the window. For example:
{"enabled": true, "check_window": "1h"}
.The datafeed can optionally search over indices that have already been read in an effort to determine whether any data has subsequently been added to the index. If missing data is found, it is a good indication that the
query_delay
option is set too low and the data is being indexed after the datafeed has passed that moment in time. See Working with delayed data.This check runs only on real-time datafeeds.
Properties of
delayed_data_check_config
-
check_window
-
(time units) The window of time that is searched for late data.
This window of time ends with the latest finalized bucket. It defaults to
null
, which causes an appropriatecheck_window
to be calculated when the real-time datafeed runs. In particular, the defaultcheck_window
span calculation is based on the maximum of2h
or8 * bucket_span
. -
enabled
-
(Boolean) Specifies whether the datafeed periodically checks for delayed data.
Defaults to
true
.
-
-
frequency
-
(Optional, time units)
The interval at which scheduled queries are made while the datafeed runs in real
time. The default value is either the bucket span for short bucket spans, or,
for longer bucket spans, a sensible fraction of the bucket span. For example:
150s
. Whenfrequency
is shorter than the bucket span, interim results for the last (partial) bucket are written then eventually overwritten by the full bucket results. If the datafeed uses aggregations, this value must be divisible by the interval of the date histogram aggregation. -
indices
-
(Optional, array) An array of index names. Wildcards are supported. For example:
["it_ops_metrics", "server*"]
.If any indices are in remote clusters then
node.remote_cluster_client
must not be set tofalse
on any machine learning nodes. -
max_empty_searches
-
(Optional, integer) If a real-time datafeed has never seen any data (including during any initial training period) then it will automatically stop itself and close its associated job after this many real-time searches that return no documents. In other words, it will stop after
frequency
timesmax_empty_searches
of real-time operation. If not set then a datafeed with no end time that sees no data will remain started until it is explicitly stopped. By default this setting is not set.The special value
-1
unsets this setting. -
query
-
(Optional, object) The Elasticsearch query domain-specific language (DSL). This value corresponds to the query object in an Elasticsearch search POST body. All the options that are supported by Elasticsearch can be used, as this object is passed verbatim to Elasticsearch. By default, this property has the following value:
{"match_all": {"boost": 1}}
.If you change the query, the analyzed data is also changed. Therefore, the required time to learn might be long and the understandability of the results is unpredictable. If you want to make significant changes to the source data, we would recommend you clone it and create a second job containing the amendments. Let both run in parallel and close one when you are satisfied with the results of the other job.
-
query_delay
-
(Optional, time units)
The number of seconds behind real time that data is queried. For example, if
data from 10:04 a.m. might not be searchable in Elasticsearch until 10:06 a.m., set this
property to 120 seconds. The default value is randomly selected between
60s
and120s
. This randomness improves the query performance when there are multiple jobs running on the same node. For more information, see Handling delayed data. -
script_fields
- (Optional, object) Specifies scripts that evaluate custom expressions and returns script fields to the datafeed. The detector configuration objects in a job can contain functions that use these script fields. For more information, see Transforming data with script fields and Script fields.
-
scroll_size
-
(Optional, unsigned integer)
The
size
parameter that is used in Elasticsearch searches when the datafeed does not use aggregations. The default value is1000
. The maximum value is the value ofindex.max_result_window
which is 10,000 by default. -
indices_options
-
(Optional, object) Specifies index expansion options that are used during search.
For example:
{ "expand_wildcards": ["all"], "ignore_unavailable": true, "allow_no_indices": "false", "ignore_throttled": true }
For more information about these options, see Multi-target syntax.
Examples
editPOST _ml/datafeeds/datafeed-total-requests/_update { "query": { "term": { "level": "error" } } }
When the datafeed is updated, you receive the full datafeed configuration with with the updated values:
{ "datafeed_id": "datafeed-total-requests", "job_id": "total-requests", "query_delay": "83474ms", "indices": ["server-metrics"], "query": { "term": { "level": { "value": "error", "boost": 1.0 } } }, "scroll_size": 1000, "chunking_config": { "mode": "auto" } }