> ## Documentation Index
> Fetch the complete documentation index at: https://algolia.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Assign or move a user ID

> Assigns or moves a user ID to a cluster.

<Warning>This method is **deprecated.**</Warning>

**Requires Admin API key**

The time it takes to move a user is proportional to the amount of data linked to the user ID.

## Usage

<CodeGroup>
  ```cs C# theme={"system"}
  // Initialize the client
  var client = new SearchClient(new SearchConfig("ALGOLIA_APPLICATION_ID", "ALGOLIA_API_KEY"));

  // Call the API
  var response = await client.AssignUserIdAsync(
    "user42",
    new AssignUserIdParams { Cluster = "d4242-eu" }
  );

  // print the response
  Console.WriteLine(response);
  ```

  ```dart Dart theme={"system"}
  // Initialize the client
  final client =
      SearchClient(appId: 'ALGOLIA_APPLICATION_ID', apiKey: 'ALGOLIA_API_KEY');

  // Call the API
  final response = await client.assignUserId(
    xAlgoliaUserID: "user42",
    assignUserIdParams: AssignUserIdParams(
      cluster: "d4242-eu",
    ),
  );

  // print the response
  print(response);
  ```

  ```go Go theme={"system"}
  // Initialize the client
  client, err := search.NewClient("ALGOLIA_APPLICATION_ID", "ALGOLIA_API_KEY")
  if err != nil {
    // The client can fail to initialize if you pass an invalid parameter.
    panic(err)
  }

  // Call the API
  response, err := client.AssignUserId(client.NewApiAssignUserIdRequest(
    "user42",
    search.NewEmptyAssignUserIdParams().SetCluster("d4242-eu")))
  if err != nil {
    // handle the eventual error
    panic(err)
  }


  // print the response
  print(response)
  ```

  ```java Java theme={"system"}
  // Initialize the client
  SearchClient client = new SearchClient("ALGOLIA_APPLICATION_ID", "ALGOLIA_API_KEY");

  // Call the API
  CreatedAtResponse response = client.assignUserId("user42", new AssignUserIdParams().setCluster("d4242-eu"));

  // print the response
  System.out.println(response);
  ```

  ```js JavaScript theme={"system"}
  // Initialize the client
  const client = algoliasearch('ALGOLIA_APPLICATION_ID', 'ALGOLIA_API_KEY');

  // Call the API
  const response = await client.assignUserId({ xAlgoliaUserID: 'user42', assignUserIdParams: { cluster: 'd4242-eu' } });


  // print the response
  console.log(response);
  ```

  ```kotlin Kotlin theme={"system"}
  // Initialize the client
  val client = SearchClient(appId = "ALGOLIA_APPLICATION_ID", apiKey = "ALGOLIA_API_KEY")

  // Call the API
  var response =
    client.assignUserId(
      xAlgoliaUserID = "user42",
      assignUserIdParams = AssignUserIdParams(cluster = "d4242-eu"),
    )


  // print the response
  println(response)
  ```

  ```php PHP theme={"system"}
  // Initialize the client
  $client = SearchClient::create('ALGOLIA_APPLICATION_ID', 'ALGOLIA_API_KEY');

  // Call the API
  $response = $client->assignUserId(
      'user42',
      ['cluster' => 'd4242-eu',
      ],
  );


  // print the response
  var_dump($response);
  ```

  ```python Python theme={"system"}
  # Initialize the client
  # In an asynchronous context, you can use SearchClient instead, which exposes the exact same methods.
  client = SearchClientSync("ALGOLIA_APPLICATION_ID", "ALGOLIA_API_KEY")

  # Call the API
  response = client.assign_user_id(
      x_algolia_user_id="user42",
      assign_user_id_params={
          "cluster": "d4242-eu",
      },
  )


  # print the response
  print(response)
  ```

  ```ruby Ruby theme={"system"}
  # Initialize the client
  client = Algolia::SearchClient.create("ALGOLIA_APPLICATION_ID", "ALGOLIA_API_KEY")

  # Call the API
  response = client.assign_user_id("user42", Algolia::Search::AssignUserIdParams.new(cluster: "d4242-eu"))


  # print the response
  puts(response)
  ```

  ```scala Scala theme={"system"}
  // Initialize the client
  val client = SearchClient(appId = "ALGOLIA_APPLICATION_ID", apiKey = "ALGOLIA_API_KEY")

  // Call the API
  val response = Await.result(
    client.assignUserId(
      xAlgoliaUserID = "user42",
      assignUserIdParams = AssignUserIdParams(
        cluster = "d4242-eu"
      )
    ),
    Duration(100, "sec")
  )

  // print the response
  println(response)
  ```

  ```swift Swift theme={"system"}
  // Initialize the client
  let client = try SearchClient(appID: "ALGOLIA_APPLICATION_ID", apiKey: "ALGOLIA_API_KEY")

  // Call the API
  let response = try await client.assignUserId(
      xAlgoliaUserID: "user42",
      assignUserIdParams: AssignUserIdParams(cluster: "d4242-eu")
  )

  // print the response
  print(response)
  ```
</CodeGroup>

<Card icon="folder-code" horizontal="true" title="See the full API reference" arrow="true" href="/doc/rest-api/search/assign-user-id">
  For more details about input parameters
  and response fields.
</Card>