opensearch-docs-cn/_query-dsl/specialized/neural.md

layout	title	parent	grand_parent	nav_order
default	Neural	Specialized queries	Query DSL	50

Neural query

Use the neural query for vector field search in neural search.

Request fields

Include the following request fields in the neural query:

"neural": {
  "<vector_field>": {
    "query_text": "<query_text>",
    "query_image": "<image_binary>",
    "model_id": "<model_id>",
    "k": 100
  }
}

The top-level vector_field specifies the vector field against which to run a search query. The following table lists the other neural query fields.

Field | Data type | Required/Optional | Description :--- | :--- | :--- query_text | String | Optional | The query text from which to generate vector embeddings. You must specify at least one query_text or query_image. query_image | String | Optional | A base-64 encoded string that corresponds to the query image from which to generate vector embeddings. You must specify at least one query_text or query_image. model_id | String | Required if the default model ID is not set. For more information, see Setting a default model on an index or field. | The ID of the model that will be used to generate vector embeddings from the query text. The model must be deployed in OpenSearch before it can be used in neural search. For more information, see Using custom models within OpenSearch and Neural search. k | Integer | Optional | The number of results returned by the k-NN search. Default is 10. filter | Object | Optional | A query that can be used to reduce the number of documents considered. For more information about filter usage, see k-NN search with filters. Important: Filter can only be used with the faiss or lucene engines.

Example request

GET /my-nlp-index/_search
{
  "query": {
    "neural": {
      "passage_embedding": {
        "query_text": "Hi world",
        "query_image": "iVBORw0KGgoAAAAN...",
        "k": 100,
        "filter": {
          "bool": {
            "must": [
              {
                "range": {
                  "rating": {
                    "gte": 8,
                    "lte": 10
                  }
                }
              },
              {
                "term": {
                  "parking": "true"
                }
              }
            ]
          }
        }
      }
    }
  }
}

{% include copy-curl.html %}