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104 lines
2.6 KiB
Markdown
104 lines
2.6 KiB
Markdown
---
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navigation_title: "Semantic"
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mapped_pages:
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- https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-semantic-query.html
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---
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# Semantic query [query-dsl-semantic-query]
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The `semantic` query type enables you to perform [semantic search](docs-content://solutions/search/semantic-search.md) on data stored in a [`semantic_text`](/reference/elasticsearch/mapping-reference/semantic-text.md) field.
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## Example request [semantic-query-example]
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```console
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GET my-index-000001/_search
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{
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"query": {
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"semantic": {
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"field": "inference_field",
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"query": "Best surfing places"
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}
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}
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}
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```
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## Top-level parameters for `semantic` [semantic-query-params]
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`field`
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: (Required, string) The `semantic_text` field to perform the query on.
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`query`
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: (Required, string) The query text to be searched for on the field.
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Refer to [this tutorial](docs-content://solutions/search/semantic-search/semantic-search-semantic-text.md) to learn more about semantic search using `semantic_text` and `semantic` query.
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## Hybrid search with the `semantic` query [hybrid-search-semantic]
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The `semantic` query can be used as a part of a hybrid search where the `semantic` query is combined with lexical queries. For example, the query below finds documents with the `title` field matching "mountain lake", and combines them with results from a semantic search on the field `title_semantic`, that is a `semantic_text` field. The combined documents are then scored, and the top 3 top scored documents are returned.
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```console
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POST my-index/_search
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{
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"size" : 3,
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"query": {
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"bool": {
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"should": [
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{
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"match": {
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"title": {
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"query": "mountain lake",
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"boost": 1
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}
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}
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},
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{
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"semantic": {
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"field": "title_semantic",
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"query": "mountain lake",
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"boost": 2
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}
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}
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]
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}
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}
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}
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```
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You can also use semantic_text as part of [Reciprocal Rank Fusion](/reference/elasticsearch/rest-apis/reciprocal-rank-fusion.md) to make ranking relevant results easier:
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```console
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GET my-index/_search
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{
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"retriever": {
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"rrf": {
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"retrievers": [
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{
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"standard": {
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"query": {
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"term": {
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"text": "shoes"
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}
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}
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}
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},
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{
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"standard": {
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"query": {
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"semantic": {
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"field": "semantic_field",
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"query": "shoes"
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}
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}
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}
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}
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],
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"rank_window_size": 50,
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"rank_constant": 20
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}
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}
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}
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```
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