Create an advances Search system for Drupal 8 with Search API

Search API and Database Search server.

1. Uninstall drupal basic Search
2. Install search_api and search_api_db
  NOTE : You can also use another database configures on settings.php
3. Add a Search Server (/admin/config/search/search-api/add-server).
  - Use "Database" as cackend server.
3. Add a Search Index (/admin/config/search/search-api/add-index).
  - Select Enteties (Data source) to index with this index and a search server.
  - Save and Add fields to Index. (Example : Title, Body file for "Contents").
  - Optionaly you can configure "Processors" as Filters, Data traitements ...
4. Enable the newly created "Index" then run indexing or queue indexing.
5. Create a view using your Index, and add field "Search: Fulltext search" as Exposed criteris filter.

Once indexing is done, visit the view's page to use the search system.

Tips : For a quick start, just install the "Database Search Defaults" (), and configure your "Search Server", "Index" and "Search Pages" on.
 - Search API :        /admin/config/search/search-api
 - Search Views :    /admin/structure/views (Defaut : /admin/structure/views/view/search_content )

NOTE : To create a server like Solr, Elasticsearch you need to install search server and the drupal module for those servers.