title: HealthIndicators for spring boot actuator
body: <p>we are trying to healthcheck a spring boot application, we are planning to use spring boot actuator health to get the health status.</p>
  
  <p>what is confusing is which classes provide the default healthcheck status ({"status":"UP"}) when CassandraHealthIndicator, DiskSpaceHealthIndicator, DataSourceHealthIndicator, ElasticsearchHealthIndicator,
  JmsHealthIndicator, MailHealthIndicator, MongoHealthIndicator, RabbitHealthIndicator, RedisHealthIndicator, SolrHealthIndicator are not applicable.</p>