I solved the problem.
The error was due to the restriction of user roles.
The user created inside the module does not have rights to add such a Engine.
And API keys too.
Only assigning roles enterprise-search-workplace-search-admin and enterprise-search-app-search-owner made it possible to add Engine type = elasticsearch.
At the same time, the procedure for adding this type of sources is not described anywhere in the documentation.
This is not documented yet, as this is a beta feature that is undergoing changes at this very moment. We have lots of plans for Elasticsearch based Engines. Stay tuned!
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