async fn create_association_batch(
        &self,
        input: CreateAssociationBatchRequest,
    ) -> Result<CreateAssociationBatchResult, RusotoError<CreateAssociationBatchError>> {
        let mut request = self.new_signed_request("POST", "/");
        request.add_header("x-amz-target", "AmazonSSM.CreateAssociationBatch");
        let encoded = serde_json::to_string(&input).unwrap();
        request.set_payload(Some(encoded));

        let response = self
            .sign_and_dispatch(request, CreateAssociationBatchError::from_response)
            .await?;
        let mut response = response;
        let response = response.buffer().await.map_err(RusotoError::HttpDispatch)?;
        proto::json::ResponsePayload::new(&response)
            .deserialize::<CreateAssociationBatchResult, _>()
    }
<p>Associates the specified Systems Manager document with the specified instances or targets.</p> <p>When you associate a document with one or more instances using instance IDs or tags, SSM Agent running on the instance processes the document and configures the instance as specified.</p> <p>If you associate a document with an instance that already has an associated document, the system returns the AssociationAlreadyExists exception.</p>
rusoto/services/ssm/src/generated.rs