The site crash when add a server
Collection is required in solr configuration. You'll need to create a collection you want to use for your site. Create using below command or by user interface of solr, then use the same name for the collection.


  sudo su - solr -c "/opt/solr/bin/solr create -c COLLECTION_NAME -n
  data_driven_schema_configs" // Only for ubuntu


Replace COLLECTION_NAME with the name of your collection you want.