Service/library to extract keywords?

Question

Search engines

Greetings!
We are looking for an online service with an API or a library for extracting keywords from text in Russian.
Tell me please.
PS From Google: https://cloud.google.com/natural-language/ I tried it, but somehow it works strangely with Russian. Great with English.

Answer 1

We determine the part of speech and scatter it sorted in descending order by repetition frequency: adjective + noun and just a noun.
You can write this yourself in 3 hours.