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Updates the specified destination of the specified delivery stream. Note: Switching between Elasticsearch and other services is not supported. For Elasticsearch destination, you can only update an existing Elasticsearch destination with this operation.

This operation can be used to change the destination type (for example, to replace the Amazon S3 destination with Amazon Redshift) or change the parameters associated with a given destination (for example, to change the bucket name of the Amazon S3 destination). The update may not occur immediately. The target delivery stream remains active while the configurations are updated, so data writes to the delivery stream can continue during this process. The updated configurations are normally effective within a few minutes.

If the destination type is the same, Firehose merges the configuration parameters specified in the UpdateDestination request with the destination configuration that already exists on the delivery stream. If any of the parameters are not specified in the update request, then the existing configuration parameters are retained. For example, in the Amazon S3 destination, if EncryptionConfiguration is not specified then the existing EncryptionConfiguration is maintained on the destination.

If the destination type is not the same, for example, changing the destination from Amazon S3 to Amazon Redshift, Firehose does not merge any parameters. In this case, all parameters must be specified.

Firehose uses the CurrentDeliveryStreamVersionId to avoid race conditions and conflicting merges. This is a required field in every request and the service only updates the configuration if the existing configuration matches the VersionId. After the update is applied successfully, the VersionId is updated, which can be retrieved with the DescribeDeliveryStream operation. The new VersionId should be uses to set CurrentDeliveryStreamVersionId in the next UpdateDestination operation.