The Administer elasticsearch connector permission (machine name administer elasticsearch connector) has been removed in the 8.0.x release series, with no replacement provided.
It will be removed from roles in the elasticsearch_connector_update_9803() update hook so that role configuration remains valid and doesn't cause errors.
The nearest replacement would be the Search API module's Administer Search API permission (machine name administer search_api).
Reasoning
The Elasticsearch Connector 8.x-7.x release series has an unstated dependency on the Search API module for its UI: in fact, Elasticsearch Connector 8.x-7.x presents no UI unless Search API is present! Further, in order to set up a usable ElasticSearch server and index, a user needed Search API's Administer Search API permission (machine name administer search_api) anyway.
For the Elasticsearch Connector 8.0.x release series, the maintainers decided to make Elasticsearch Connector's dependency on Search API more explicit, and remove the custom Elasticsearch Connector administration UI (which largely duplicated the UI provided by Search API). As a result, the pages controlled by the Administer elasticsearch connector permission no longer exist, so the permission is no longer needed.
The Elasticsearch Connector 8.0.x maintainers decided to remove the Administer elasticsearch connector permission instead of replacing it with Search API's Administer Search API permission, because Administer Search API grants wider access, which would be unsafe.
