All allowed site locales are indexed by default. To reduce indexing times and overall resource consumption, you can exclude locales from indexing that don't have a particular set of data. You can also upload an extra dictionary for more directed and appropriate search results.
Search indexing uses one localizable index for each index type: Product, Spelling, Content, Synonym, and Suggest. Each index contains all localized and non-localized data for all storefront locales. You can exclude individual locales from the indexing process if search isn't required for those locales, which will reduce indexing times and overall resource consumption.
For more directed and appropriate search results, you can upload an extra dictionary, for example, the Chinese2 stemmer.
Add locales by selecting
(with the appropriate permissions).