260 lines
7.4 KiB
Plaintext
260 lines
7.4 KiB
Plaintext
[[search-field-caps]]
|
|
=== Field Capabilities API
|
|
|
|
Allows you to retrieve the capabilities of fields among multiple indices.
|
|
For data streams, the API returns field capabilities among the stream's backing
|
|
indices.
|
|
|
|
[source,console]
|
|
--------------------------------------------------
|
|
GET /_field_caps?fields=rating
|
|
--------------------------------------------------
|
|
|
|
|
|
[[search-field-caps-api-request]]
|
|
==== {api-request-title}
|
|
|
|
`GET /_field_caps`
|
|
|
|
`POST /_field_caps`
|
|
|
|
`GET /<target>/_field_caps`
|
|
|
|
`POST /<target>/_field_caps`
|
|
|
|
|
|
[[search-field-caps-api-desc]]
|
|
==== {api-description-title}
|
|
|
|
|
|
The field capabilities API returns the information about the capabilities of
|
|
fields among multiple indices.
|
|
|
|
|
|
[[search-field-caps-api-path-params]]
|
|
==== {api-path-parms-title}
|
|
|
|
`<target>`::
|
|
(Optional, string)
|
|
Comma-separated list of data streams, indices, and index aliases used to limit
|
|
the request. Wildcard expressions (`*`) are supported.
|
|
+
|
|
To target all data streams and indices in a cluster, omit this parameter or use
|
|
`_all` or `*`.
|
|
|
|
|
|
[[search-field-caps-api-query-params]]
|
|
==== {api-query-parms-title}
|
|
|
|
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=allow-no-indices]
|
|
+
|
|
Defaults to `true`.
|
|
|
|
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=expand-wildcards]
|
|
+
|
|
--
|
|
Defaults to `open`.
|
|
--
|
|
|
|
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=fields]
|
|
|
|
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=index-ignore-unavailable]
|
|
|
|
`include_unmapped`::
|
|
(Optional, boolean) If `true`, unmapped fields are included in the response.
|
|
Defaults to `false`.
|
|
|
|
[[search-field-caps-api-request-body]]
|
|
==== {api-request-body-title}
|
|
|
|
`index_filter`::
|
|
(Optional, <<query-dsl,query object>> Allows to filter indices if the provided
|
|
query rewrites to `match_none` on every shard.
|
|
|
|
[[search-field-caps-api-response-body]]
|
|
==== {api-response-body-title}
|
|
|
|
|
|
The types used in the response describe _families_ of field types.
|
|
Normally a family type is the same as the field type declared in the mapping,
|
|
but to simplify matters certain field types that behave identically are
|
|
described using a family type. For example, `keyword`, `constant_keyword` and `wildcard`
|
|
field types are all described as the `keyword` family type.
|
|
|
|
|
|
|
|
`searchable`::
|
|
Whether this field is indexed for search on all indices.
|
|
|
|
`aggregatable`::
|
|
Whether this field can be aggregated on all indices.
|
|
|
|
`indices`::
|
|
The list of indices where this field has the same family type, or null if all indices
|
|
have the same family type for the field.
|
|
|
|
`non_searchable_indices`::
|
|
The list of indices where this field is not searchable, or null if all indices
|
|
have the same definition for the field.
|
|
|
|
`non_aggregatable_indices`::
|
|
The list of indices where this field is not aggregatable, or null if all
|
|
indices have the same definition for the field.
|
|
|
|
`meta`::
|
|
Merged metadata across all indices as a map of string keys to arrays of values.
|
|
A value length of 1 indicates that all indices had the same value for this key,
|
|
while a length of 2 or more indicates that not all indices had the same value
|
|
for this key.
|
|
|
|
|
|
[[search-field-caps-api-example]]
|
|
==== {api-examples-title}
|
|
|
|
|
|
The request can be restricted to specific data streams and indices:
|
|
|
|
[source,console]
|
|
--------------------------------------------------
|
|
GET twitter/_field_caps?fields=rating
|
|
--------------------------------------------------
|
|
// TEST[setup:twitter]
|
|
|
|
|
|
The next example API call requests information about the `rating` and the
|
|
`title` fields:
|
|
|
|
[source,console]
|
|
--------------------------------------------------
|
|
GET _field_caps?fields=rating,title
|
|
--------------------------------------------------
|
|
|
|
The API returns the following response:
|
|
|
|
[source,console-result]
|
|
--------------------------------------------------
|
|
{
|
|
"indices": ["index1", "index2", "index3", "index4", "index5"],
|
|
"fields": {
|
|
"rating": { <1>
|
|
"long": {
|
|
"searchable": true,
|
|
"aggregatable": false,
|
|
"indices": ["index1", "index2"],
|
|
"non_aggregatable_indices": ["index1"] <2>
|
|
},
|
|
"keyword": {
|
|
"searchable": false,
|
|
"aggregatable": true,
|
|
"indices": ["index3", "index4"],
|
|
"non_searchable_indices": ["index4"] <3>
|
|
}
|
|
},
|
|
"title": { <4>
|
|
"text": {
|
|
"searchable": true,
|
|
"aggregatable": false
|
|
|
|
}
|
|
}
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// TESTRESPONSE[skip:historically skipped]
|
|
|
|
<1> The field `rating` is defined as a long in `index1` and `index2`
|
|
and as a `keyword` in `index3` and `index4`.
|
|
<2> The field `rating` is not aggregatable in `index1`.
|
|
<3> The field `rating` is not searchable in `index4`.
|
|
<4> The field `title` is defined as `text` in all indices.
|
|
|
|
|
|
By default unmapped fields are ignored. You can include them in the response by
|
|
adding a parameter called `include_unmapped` in the request:
|
|
|
|
[source,console]
|
|
--------------------------------------------------
|
|
GET _field_caps?fields=rating,title&include_unmapped
|
|
--------------------------------------------------
|
|
|
|
In which case the response will contain an entry for each field that is present
|
|
in some indices but not all:
|
|
|
|
[source,console-result]
|
|
--------------------------------------------------
|
|
{
|
|
"indices": ["index1", "index2", "index3"],
|
|
"fields": {
|
|
"rating": {
|
|
"long": {
|
|
"searchable": true,
|
|
"aggregatable": false,
|
|
"indices": ["index1", "index2"],
|
|
"non_aggregatable_indices": ["index1"]
|
|
},
|
|
"keyword": {
|
|
"searchable": false,
|
|
"aggregatable": true,
|
|
"indices": ["index3", "index4"],
|
|
"non_searchable_indices": ["index4"]
|
|
},
|
|
"unmapped": { <1>
|
|
"indices": ["index5"],
|
|
"searchable": false,
|
|
"aggregatable": false
|
|
}
|
|
},
|
|
"title": {
|
|
"text": {
|
|
"indices": ["index1", "index2", "index3", "index4"],
|
|
"searchable": true,
|
|
"aggregatable": false
|
|
},
|
|
"unmapped": { <2>
|
|
"indices": ["index5"]
|
|
"searchable": false,
|
|
"aggregatable": false
|
|
}
|
|
}
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// TESTRESPONSE[skip:historically skipped]
|
|
|
|
<1> The `rating` field is unmapped` in `index5`.
|
|
<2> The `title` field is unmapped` in `index5`.
|
|
|
|
It is also possible to filter indices with a query:
|
|
|
|
[source,console]
|
|
--------------------------------------------------
|
|
POST twitter*/_field_caps?fields=rating
|
|
{
|
|
"index_filter": {
|
|
"range": {
|
|
"@timestamp": {
|
|
"gte": "2018"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
--------------------------------------------------
|
|
// TEST[setup:twitter]
|
|
|
|
|
|
In which case indices that rewrite the provided filter to `match_none` on every shard
|
|
will be filtered from the response.
|
|
|
|
--
|
|
[IMPORTANT]
|
|
====
|
|
The filtering is done on a best-effort basis, it uses index statistics and mappings
|
|
to rewrite queries to `match_none` instead of fully executing the request.
|
|
For instance a `range` query over a `date` field can rewrite to `match_none`
|
|
if all documents within a shard (including deleted documents) are outside
|
|
of the provided range.
|
|
However, not all queries can rewrite to `match_none` so this API may return
|
|
an index even if the provided filter matches no document.
|
|
====
|
|
--
|