Helpful Articles/ Docs:

• More on partialFilterExpressions: https://docs.mongodb.com/manual/core/index-partial/

• Supported default_languages: https://docs.mongodb.com/manual/reference/text-search-languages/#text-search-languages

• How to use different languages in the same index: https://docs.mongodb.com/manual/tutorial/specify-language-for-text-index/#create-a-text-index-for-a-collection-in-multiple-languages