Sparse vector field type
editSparse vector field type
editA sparse_vector
field can index features and weights so that they can later be used to query
documents in queries with a text_expansion
query.
sparse_vector
is the field type that should be used with ELSER mappings.
PUT my-index { "mappings": { "properties": { "text.tokens": { "type": "sparse_vector" } } } }
See semantic search with ELSER for a complete example on adding documents
to a sparse_vector
mapped field using ELSER.
sparse_vector
fields can not be included in indices that were created on Elasticsearch versions between 8.0 and 8.10
sparse_vector
fields only support single-valued fields and strictly positive
values. Multi-valued fields and negative values will be rejected.
sparse_vector
fields do not support querying, sorting or aggregating. They may
only be used within text_expansion
queries.
sparse_vector
fields only preserve 9 significant bits for the precision, which
translates to a relative error of about 0.4%.