When will similarity calculations run? And calculation order

[otiai10]

Thanks for the great plugin.

I have questions.

1. When will similarity calculations run?
   • Having read the docs, it seems to be at the same time as create record on index. isn't it?
2. What is the order of the similarity calculations?
   • For example, if N records are already created, what will happen on adding more records?

I guess your plugin to be powerful enough to use in production-environment.
Thank you

[nd2s]

I'd also appreciate an answer to these questions.