版本：0.6.22
- https://cdn.bootcdn.net/ajax/libs/FlexSearch/0.6.22/flexsearch.compact.js
- https://cdn.bootcdn.net/ajax/libs/FlexSearch/0.6.22/flexsearch.es5.js
- https://cdn.bootcdn.net/ajax/libs/FlexSearch/0.6.22/flexsearch.light.js
- https://cdn.bootcdn.net/ajax/libs/FlexSearch/0.6.22/flexsearch.min.js