text: var is = require('joi');
  
  module.exports = is.object({
    _id: is.string().regex(/^country_[A-Z]{2}$/),
    country_code: is.string().uppercase().length(2),
    doc_type: 'country',
    country_name: is.string().regex(/[A-Z].*/),
    continent_code: is.string().uppercase().length(2),
  });
  