How to to update index mapping dynamicly

I have to support dynamic_templates for many languages. What is the best approach in regards to index mapping if
we want to add mappings for different languages based on document language field

  1. Is it better to upload all of them using in index template at once for all languages or update dynamic_templates by adding new mapping for given language on demand ?
    2 is it possibly to update index settings and mapping at one rest request?

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