Leve fragmentação para seu aplicativo do Spring Boot com o Spring Data MongoDB

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mongosh "mongodb+srv://<username>:<password>@<cluster-url>/admin"

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sh.shardCollection("sample_mflix.users", { email: 1 })

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import org.springframework.data.annotation.Id;
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import org.springframework.data.mongodb.core.mapping.Document;
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import org.springframework.data.mongodb.core.mapping.Field;
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import org.springframework.data.mongodb.core.mapping.Sharded;
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@Document("users")
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@Sharded(shardKey = { "email" }) 
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public class User {
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    @Id
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    private String id;
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    private String name;
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    @Field("email")
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    private String email;
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    private String password;
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    // Getters and Setters
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}

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import org.springframework.data.mongodb.repository.MongoRepository;
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import com.mongodb.sharded.model.User;
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public interface UserRepository extends MongoRepository<User, String> {
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}

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import java.util.List;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Service;
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import com.mongodb.sharded.model.User;
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import com.mongodb.sharded.repository.UserRepository;
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@Service
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public class UserService {
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    @Autowired
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    private UserRepository userRepository;
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    public List<User> getAllUsers() {
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        return userRepository.findAll();
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    }
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    public User saveUser(User user) {
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        return userRepository.save(user);
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    }
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}

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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.web.bind.annotation.*;
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import java.util.List;
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@RestController
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@RequestMapping("/users")
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public class UserController {
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    @Autowired
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    private UserService userService;
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    @GetMapping
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    public List<User> getAllUsers() {
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        return userService.getAllUsers();
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    }
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    @PostMapping
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    public User createUser(@RequestBody User user) {
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        return userService.saveUser(user);
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    }
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}

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spring.data.mongodb.uri=mongodb+srv://<username>:<password>@<cluster-url>/myDatabase?retryWrites=true&w=majority