IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Dense vector field type
editDense vector field type
editA dense_vector
field stores dense vectors of float values.
The maximum number of dimensions that can be in a vector should
not exceed 2048. A dense_vector
field is a single-valued field.
These vectors can be used for document scoring. For example, a document score can represent a distance between a given query vector and the indexed document vector.
You index a dense vector as an array of floats.
PUT my-index-000001 { "mappings": { "properties": { "my_vector": { "type": "dense_vector", "dims": 3 }, "my_text" : { "type" : "keyword" } } } } PUT my-index-000001/_doc/1 { "my_text" : "text1", "my_vector" : [0.5, 10, 6] } PUT my-index-000001/_doc/2 { "my_text" : "text2", "my_vector" : [-0.5, 10, 10] }
Internally, each document’s dense vector is encoded as a binary
doc value. Its size in bytes is equal to
4 * dims + 4
, where dims
—the number of the vector’s dimensions.