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Update limitations on 'dense_vector' field type support #136807

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Oct 20, 2025
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Update limitations on 'dense_vector' field type support #136807

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5 changes: 4 additions & 1 deletion docs/reference/query-languages/esql/limitations.md
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Expand Up @@ -67,7 +67,6 @@ By default, an {{esql}} query returns up to 1,000 rows. You can increase the num

* `binary`
* `completion`
* `dense_vector`
* `double_range`
* `flattened`
* `float_range`
Expand Down Expand Up @@ -98,6 +97,10 @@ Some [field types](/reference/elasticsearch/mapping-reference/field-data-types.m

In addition, when [querying multiple indexes](/reference/query-languages/esql/esql-multi-index.md), it’s possible for the same field to be mapped to multiple types. These fields cannot be directly used in queries or returned in results, unless they’re [explicitly converted to a single type](/reference/query-languages/esql/esql-multi-index.md#esql-multi-index-union-types).

* `dense_vector` field type is partially supported. [`KNN` function](elasticsearch://reference/query-languages/esql/functions-operators/dense-vector-functions.md#esql-knn) queries will work and any field data will be retrieved as part of the results. However, the type will appear as `unsupported` when the `KNN` function is not used.

This means that `FROM test` will not retrieve `dense_vector` data. But, `FROM test WHERE KNN("dense_vector_field", [0, 1, 2, ...])` will retrieve data.


## _source availability [esql-_source-availability]

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