mirror of
https://github.com/elastic/elasticsearch.git
synced 2025-06-29 09:54:06 -04:00
79 lines
No EOL
1.8 KiB
Text
79 lines
No EOL
1.8 KiB
Text
[[query-dsl-text-expansion-query]]
|
|
== Text expansion query
|
|
++++
|
|
<titleabbrev>Text expansion</titleabbrev>
|
|
++++
|
|
|
|
The text expansion query uses a {nlp} model to convert the query text into a
|
|
list of token-weight pairs which are then used in a query against a
|
|
<<rank-features,rank features field>>.
|
|
|
|
[discrete]
|
|
[[text-expansion-query-ex-request]]
|
|
=== Example request
|
|
|
|
|
|
[source,console]
|
|
----
|
|
GET _search
|
|
{
|
|
"query":{
|
|
"text_expansion":{
|
|
"<rank_features_field>":{
|
|
"model_id":"the model to produce the token weights",
|
|
"model_text":"the query string"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
----
|
|
// TEST[skip: TBD]
|
|
|
|
[discrete]
|
|
[[text-expansion-query-params]]
|
|
=== Top level parameters for `text_expansion`
|
|
|
|
`<rank_features_field>`:::
|
|
(Required, object)
|
|
The name of the field that contains the token-weight pairs the NLP model created
|
|
based on the input text.
|
|
|
|
[discrete]
|
|
[[text-expansion-rank-feature-field-params]]
|
|
=== Top level parameters for `<rank_features_field>`
|
|
|
|
`model_id`::::
|
|
(Required, string)
|
|
The ID of the model to use to convert the query text into token-weight pairs. It
|
|
must be the same model ID that was used to create the tokens from the input
|
|
text.
|
|
|
|
`model_text`::::
|
|
(Required, string)
|
|
The query text you want to use for search.
|
|
|
|
|
|
[discrete]
|
|
[[text-expansion-query-notes]]
|
|
=== Notes
|
|
|
|
The following is an example of the `text_expansion` query that references the
|
|
ELSER model to perform semantic search. For a more detailed description of how
|
|
to perform semantic search by using ELSER and the `text_expansion` query, refer
|
|
to <<semantic-search-elser,this tutorial>>.
|
|
|
|
[source,console]
|
|
----
|
|
GET my-index/_search
|
|
{
|
|
"query":{
|
|
"text_expansion":{
|
|
"ml.tokens":{
|
|
"model_id":".elser_model_1",
|
|
"model_text":"How is the weather in Jamaica?"
|
|
}
|
|
}
|
|
}
|
|
}
|
|
----
|
|
// TEST[skip: TBD] |