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a8250b26e7
This change introduces a new API called `_field_caps` that allows to retrieve the capabilities of specific fields.
Example:
````
GET t,s,v,w/_field_caps?fields=field1,field2
````
... returns:
````
{
"fields": {
"field1": {
"string": {
"searchable": true,
"aggregatable": true
}
},
"field2": {
"keyword": {
"searchable": false,
"aggregatable": true,
"non_searchable_indices": ["t"]
"indices": ["t", "s"]
},
"long": {
"searchable": true,
"aggregatable": false,
"non_aggregatable_indices": ["v"]
"indices": ["v", "w"]
}
}
}
}
````
In this example `field1` have the same type `text` across the requested indices `t`, `s`, `v`, `w`.
Conversely `field2` is defined with two conflicting types `keyword` and `long`.
Note that `_field_caps` does not treat this case as an error but rather return the list of unique types seen for this field.
127 lines
3.1 KiB
Plaintext
127 lines
3.1 KiB
Plaintext
[[search-field-caps]]
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== Field Capabilities API
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experimental[]
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The field capabilities API allows to retrieve the capabilities of fields among multiple indices.
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The field capabilities api by default executes on all indices:
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[source,js]
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--------------------------------------------------
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GET _field_caps?fields=rating
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--------------------------------------------------
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// CONSOLE
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... but the request can also be restricted to specific indices:
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[source,js]
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--------------------------------------------------
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GET twitter/_field_caps?fields=rating
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--------------------------------------------------
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// CONSOLE
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// TEST[setup:twitter]
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Alternatively the `fields` option can also be defined in the request body:
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[source,js]
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--------------------------------------------------
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POST _field_caps
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{
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"fields" : ["rating"]
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}
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--------------------------------------------------
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// CONSOLE
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This is equivalent to the previous request.
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Supported request options:
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[horizontal]
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`fields`:: A list of fields to compute stats for. The field name supports wildcard notation. For example, using `text_*`
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will cause all fields that match the expression to be returned.
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[float]
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=== Field Capabilities
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The field capabilities api returns the following information per field:
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[horizontal]
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`is_searchable`::
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Whether this field is indexed for search on all indices.
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`is_aggregatable`::
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Whether this field can be aggregated on all indices.
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`indices`::
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The list of indices where this field has the same type,
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or null if all indices have the same type for the field.
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`non_searchable_indices`::
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The list of indices where this field is not searchable,
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or null if all indices have the same definition for the field.
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`non_aggregatable_indices`::
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The list of indices where this field is not aggregatable,
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or null if all indices have the same definition for the field.
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[float]
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=== Response format
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Request:
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[source,js]
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--------------------------------------------------
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GET _field_caps?fields=rating,title
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--------------------------------------------------
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// CONSOLE
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[source,js]
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--------------------------------------------------
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{
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"fields": {
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"rating": { <1>
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"long": {
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"is_searchable": true,
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"is_aggregatable": false,
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"indices": ["index1", "index2"],
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"non_aggregatable_indices": ["index1"] <2>
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},
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"keyword": {
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"is_searchable": false,
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"is_aggregatable": true,
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"indices": ["index3", "index4"],
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"non_searchable_indices": ["index4"] <3>
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}
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},
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"title": { <4>
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"text": {
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"is_searchable": true,
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"is_aggregatable": false
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}
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}
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}
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}
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--------------------------------------------------
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// NOTCONSOLE
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<1> The field `rating` is defined as a long in `index1` and `index2`
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and as a `keyword` in `index3` and `index4`.
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<2> The field `rating` is not aggregatable in `index1`.
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<3> The field `rating` is not searchable in `index4`.
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<4> The field `title` is defined as `text` in all indices.
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