title: MongoDB(without Mongoos) and ElasticSearch Health Check in Nestjs
body: <p>I am new in Nestjs. and I want to add Health Check Route into my application.
  I using Mongodb and ElasticSearch in my application. but I don't know to implement Health check for both.</p>
  <p>I am not using Mongoose to connect to mongodb. I am directly using mongodb module. and in case of Elastic Search I am using @nestjs/elasticsearch module.</p>