* Feature: Custom configuration for elasticsearch

For better search results especially in Chinese, which the standard token analyzer may not work well.

* Set default analyzer in settings when building index

* Remove dangling comma

* - Modify elastic settings
- Add tags field to index
- Modify elastic search query
- Remove empty entities from build suggests list

* Fix map parser error

* - Fix broken drawio svg diagram (rtl issue)

* - Restore the spaces in objects to respect the project formatting rules.
- Omit explanation line

+ Remove duplicated await
+ Replace some legacy codes with ES6
+ Fix some of eslint problems

Improved full text search in elastic provider