DomainRepository.java

package com.mkyong.domain;

import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.data.mongodb.repository.Query;

import java.util.List;

public interface DomainRepository extends MongoRepository<Domain, Long> {

    Domain findByDomainAndIP(String domain, String ip);

    @Query("{domain: { $regex: ?0 } })")
    List<Domain> findCustomByRegExDomain(String domain);

	//how to update a particular field? save() is not what I want.
}