handle search type

[mascarpon3]

description

In Docs we want to feature flags some users on hybrid search and some others on full-text. To do so we need to handle the search type at run time instead of handling it with settings like we are currently doing.

requirements

• add a search_type params on the search route
• take the params.search_type and the hybrid_search_enabled into account to decide on the search type.

[mascarpon3]

https://github.com/suitenumerique/find/pull/51/changes