# Create One Rolling Index

**POST /api/atlas/v1.0/groups/{groupId}/clusters/{clusterName}/index**

Creates an index on the cluster identified by its name in a rolling manner. Creating the index in this way allows index builds on one replica set member as a standalone at a time, starting with the secondary members. Creating indexes in this way requires at least one replica set election. To use this resource, the requesting Service Account or API Key must have the Project Data Access Admin role.

[Rolling Index Builds on Replica Sets](https://docs.mongodb.com/manual/tutorial/build-indexes-on-replica-sets/)

## Servers
- https://cloud.mongodb.com: https://cloud.mongodb.com ()


## Authentication methods
- Service accounts
- Digest auth


## Parameters

#### Path parameters
- **groupId** (string)
  Unique 24-hexadecimal digit string that identifies your project. Use the [/groups](#tag/Projects/operation/listProjects) endpoint to retrieve all projects to which the authenticated user has access.

**NOTE**: Groups and projects are synonymous terms. Your group id is the same as your project id. For existing groups, your group/project id remains the same. The resource and corresponding endpoints use the term groups.
- **clusterName** (string)
  Human-readable label that identifies the cluster on which MongoDB Cloud creates an index.

#### Query parameters
- **envelope** (boolean)
  Flag that indicates whether Application wraps the response in an `envelope` JSON object. Some API clients cannot access the HTTP response headers or status code. To remediate this, set envelope=true in the query. Endpoints that return a list of results use the results object as an envelope. Application adds the status parameter to the response body.
- **pretty** (boolean)
  Flag that indicates whether the response body should be in the prettyprint format.

## Body parameters
Content-type: application/json
Rolling index to create on the specified cluster.
- **collation** (object)
  One or more settings that specify language-specific rules to compare strings within this index.
- **collection** (string)
  Human-readable label of the collection for which MongoDB Cloud creates an index.
- **db** (string)
  Human-readable label of the database that holds the collection on which MongoDB Cloud creates an index.
- **keys** (array[object])
  List that contains one or more objects that describe the parameters that you want to index.
- **options** (object)
  One or more settings that determine how the MongoDB Cloud creates this MongoDB index.

## Responses
### 202: Accepted

### 400: Bad Request.

#### Body Parameters: application/json (object)
- **badRequestDetail** (object)
  Bad request detail.
- **detail** (string)
  Describes the specific conditions or reasons that cause each type of error.
- **error** (integer(int32))
  HTTP status code returned with this error.
- **errorCode** (string)
  Application error code returned with this error.
- **parameters** (array[object])
  Parameters used to give more information about the error.
- **reason** (string)
  Application error message returned with this error.

### 401: Unauthorized.

#### Body Parameters: application/json (object)
- **badRequestDetail** (object)
  Bad request detail.
- **detail** (string)
  Describes the specific conditions or reasons that cause each type of error.
- **error** (integer(int32))
  HTTP status code returned with this error.
- **errorCode** (string)
  Application error code returned with this error.
- **parameters** (array[object])
  Parameters used to give more information about the error.
- **reason** (string)
  Application error message returned with this error.

### 403: Forbidden.

#### Body Parameters: application/json (object)
- **badRequestDetail** (object)
  Bad request detail.
- **detail** (string)
  Describes the specific conditions or reasons that cause each type of error.
- **error** (integer(int32))
  HTTP status code returned with this error.
- **errorCode** (string)
  Application error code returned with this error.
- **parameters** (array[object])
  Parameters used to give more information about the error.
- **reason** (string)
  Application error message returned with this error.

### 404: Not Found.

#### Body Parameters: application/json (object)
- **badRequestDetail** (object)
  Bad request detail.
- **detail** (string)
  Describes the specific conditions or reasons that cause each type of error.
- **error** (integer(int32))
  HTTP status code returned with this error.
- **errorCode** (string)
  Application error code returned with this error.
- **parameters** (array[object])
  Parameters used to give more information about the error.
- **reason** (string)
  Application error message returned with this error.

### 429: Too Many Requests.

#### Body Parameters: application/json (object)
- **badRequestDetail** (object)
  Bad request detail.
- **detail** (string)
  Describes the specific conditions or reasons that cause each type of error.
- **error** (integer(int32))
  HTTP status code returned with this error.
- **errorCode** (string)
  Application error code returned with this error.
- **parameters** (array[object])
  Parameters used to give more information about the error.
- **reason** (string)
  Application error message returned with this error.

### 500: Internal Server Error.

#### Body Parameters: application/json (object)
- **badRequestDetail** (object)
  Bad request detail.
- **detail** (string)
  Describes the specific conditions or reasons that cause each type of error.
- **error** (integer(int32))
  HTTP status code returned with this error.
- **errorCode** (string)
  Application error code returned with this error.
- **parameters** (array[object])
  Parameters used to give more information about the error.
- **reason** (string)
  Application error message returned with this error.


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