apollo-portal/src/main/java/com/ctrip/framework/apollo/portal/spi/oidc/OidcLocalUserServiceImpl.java/OidcLocalUserServiceImpl/findUsers
class OidcLocalUserServiceImpl:  private List<UserPO> findUsers(String keyword) {
    if (StringUtils.isEmpty(keyword)) {
      return userRepository.findFirst20ByEnabled(1);
    }
    List<UserPO> users = new ArrayList<>();
    List<UserPO> byUsername = userRepository
        .findByUsernameLikeAndEnabled("%" + keyword + "%", 1);
    List<UserPO> byUserDisplayName = userRepository
        .findByUserDisplayNameLikeAndEnabled("%" + keyword + "%", 1);
    if (!CollectionUtils.isEmpty(byUsername)) {
      users.addAll(byUsername);
    }
    if (!CollectionUtils.isEmpty(byUserDisplayName)) {
      users.addAll(byUserDisplayName);
    }
    return users;
  }