appwrite/docs/examples/1.5.x/server-kotlin/java/databases/update-document.md

import io.appwrite.Client;
import io.appwrite.coroutines.CoroutineCallback;
import io.appwrite.services.Databases;

Client client = new Client()
    .setEndpoint("https://cloud.appwrite.io/v1") // Your API Endpoint
    .setProject("5df5acd0d48c2") // Your project ID
    .setSession(""); // The user session to authenticate with

Databases databases = new Databases(client);

databases.updateDocument(
    "[DATABASE_ID]", // databaseId
    "[COLLECTION_ID]", // collectionId
    "[DOCUMENT_ID]", // documentId
    mapOf( "a" to "b" ), // data (optional)
    listOf("read("any")"), // permissions (optional)
    new CoroutineCallback<>((result, error) -> {
        if (error != null) {
            error.printStackTrace();
            return;
        }

        System.out.println(result);
    })
);