Request Syntax URI Request Parameters Request Body Response Syntax Response Elements Errors See Also

UpdateIndexMode

Updates the mode for an existing vector index. You can set the mode to ENHANCED for any vector index. You can set the mode to CLASSIC only for a vector index in a vector bucket created before September 30, 2026. This operation doesn't change the default index mode of the vector bucket or the mode of other vector indexes. Specify the vector index by using its Amazon Resource Name (ARN) or both the vector bucket name and vector index name.

Permissions: You must have the s3vectors:UpdateIndexMode permission to use this operation.

Request Syntax


POST /UpdateIndexMode HTTP/1.1
Content-type: application/json

{
   "indexArn": "string",
   "indexMode": "string",
   "indexName": "string",
   "vectorBucketName": "string"
}

URI Request Parameters

The request does not use any URI parameters.

Request Body

The request accepts the following data in JSON format.

indexArn

The Amazon Resource Name (ARN) of the vector index to update.

Type: String

Pattern: arn:aws[-a-z0-9]*:s3vectors:[a-z0-9-]+:[0-9]{12}:bucket/[a-z0-9][a-z0-9-.]{1,61}[a-z0-9]/index/[a-z0-9][a-z0-9-.]{1,61}[a-z0-9]

Required: No

indexMode

The new mode for the vector index.

Valid values:

CLASSIC - Applies metadata filters during the vector search. You can specify CLASSIC only for a vector index in a vector bucket created before September 30, 2026.
ENHANCED - Applies metadata filters before the vector search.

Type: String

Valid Values: CLASSIC | ENHANCED

Required: Yes

indexName

The name of the vector index to update.

Type: String

Length Constraints: Minimum length of 3. Maximum length of 63.

Required: No

vectorBucketName

The name of the vector bucket that contains the vector index.

Type: String

Length Constraints: Minimum length of 3. Maximum length of 63.

Required: No

Response Syntax


HTTP/1.1 200

Response Elements

If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

Errors

AccessDeniedException

Access denied.

HTTP Status Code: 403

InternalServerException

The request failed due to an internal server error.

HTTP Status Code: 500

NotFoundException

The request was rejected because the specified resource can't be found.

HTTP Status Code: 404

RequestTimeoutException

The request timed out. Retry your request.

HTTP Status Code: 408

ServiceUnavailableException

The service is unavailable. Wait briefly and retry your request. If it continues to fail, increase your waiting time between retries.

HTTP Status Code: 503

TooManyRequestsException

The request was denied due to request throttling.

HTTP Status Code: 429

ValidationException

The requested action isn't valid.

fieldList: A list of specific validation failures that are encountered during input processing. Each entry in the list contains a path to the field that failed validation and a detailed message that explains why the validation failed. To satisfy multiple constraints, a field can appear multiple times in this list if it failed. You can use the information to identify and fix the specific validation issues in your request.

HTTP Status Code: 400