Updated on 2026-09-03 GMT+08:00

Scaling Out a Cluster (Discarded)

Function

This API is used to scale in the number of data nodes in Elasticsearch and OpenSearch clusters. You are advised to use Adding Instances and Expanding Instance Storage Capacity.

Calling Method

For details, see Calling APIs.

URI

POST /v1.0/{project_id}/clusters/{cluster_id}/extend

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Definition Project ID. For details about how to obtain the project ID and name, see Obtaining the Project ID and Name. Constraints N/A Range Project ID of an account. The value contains 32 characters, consisting of lowercase letters and digits. Default Value N/A
cluster_id	Yes	String	Definition ID of the cluster to be scaled out. For details about how to obtain the cluster ID, see Obtaining the Cluster ID. Constraints N/A Range The value is a UUID containing 36 characters. Default Value N/A

Request Parameters

**Table 2** Request body parameters
Parameter	Mandatory	Type	Description
grow	Yes	ExtendClusterGrowReq object	Definition: Detailed description about the cluster scale-out request. Constraints: N/A Value range: N/A Default value: N/A

**Table 3** ExtendClusterGrowReq
Parameter	Mandatory	Type	Description
modifySize	Yes	Integer	Definition Number of instances to be added. Constraints The total number of existing instances and newly added instances in a cluster cannot exceed 32. Range 1-32 Default Value N/A

Response Parameters

Status code: 200

Request succeeded.

None

Example Requests

Change the number of instances in the current cluster.

POST https://{Endpoint}/v1.0/{project_id}/clusters/4f3deec3-efa8-4598-bf91-560aad1377a3/extend

{
  "grow" : {
    "modifySize" : 4
  },
  "isAutoPay" : 1
}

Example Responses

None

Status Codes

Status Code	Description
200	Request succeeded.
400	Invalid request. Modify the request before retry.
404	The requested resource could not be found. Modify the request before retry.

Status Code

Description

200

Request succeeded.

400

Invalid request.

Modify the request before retry.

404

The requested resource could not be found.