Updating user defined template in live production enviroment

Elastic Stack Elasticsearch
1

In live production environment, I use user defined templates to map data been injected in elasticsearch. If I update the user defined templates, will it interrupt elasticsearch indexing process? Will the new template mapping immediately apply to the data injected after I update the template?

2

Templates are applied when an index is created. Updating a template does not affect any existing index.

3

Thanks for your prompt reply.