Atomic reindex creates tmp index with empty setting

[metheglin]

• Rails version: 7.0.2
• Algolia Rails integration version: 3.0.0
• Algolia Client Version: 3.7.1
• Language Version:

Description

Atomic reindex (ex: Product.reindex) is always going to create tmp index with empty setting when check_settings=true. When index move completed, previous settings disappeared. Not only specified settings inside algoliasearch block, but manual setting on dashboard.

When check_settings=false this problem seems not happening.
When check_settings=true, after task done the settings of new index is always empty even though settings(customRanking,searchableAttributes,...) described in algoliasearch block (See Step to Reproduce).

By the way, I executed set_settings command manually with my setting like below and it does work. So I guess it happens because algolia_ensure_init missed when check_settings=true.

resp = AlgoliaSearch.client.set_settings(
  'Product_development', 
  Algolia::Search::IndexSettings.new({
    "searchable_attributes"=>["fulltext_search"],
    "custom_ranking"=>["desc(updated_at_i)"],
    "replicas"=>["Product_price_asc_development", "Product_price_desc_development"]
  })
)

Please check PR for better understanding. #453

Steps To Reproduce

app/models/product.rb

class Product < ApplicationRecord
  algoliasearch check_settings: true do
    attribute :title
    attribute :content
    attribute :updated_at_i
    
    customRanking ['desc(updated_at_i)']
    searchableAttributes ['title']
    indexLanguages ['ja']
  end
end

in rails console for instance

Product.reindex
  # Check dashboard, all specified settings are disappeared.
  # Not only specified settings inside algoliasearch block, but manual setting on dashboard.