Call to undefined function elasticsearch_connector_get_client_by_id()

I get this error:

Call to undefined function elasticsearch_connector_get_client_by_id()

from

sites/all/modules/elasticsearch_connector/modules/elasticsearch_watchdog/elasticsearch_watchdog.module:112

further

Call stack: Backtrace too big to show.

I do not know what it means but it seems to slow things down quite a bit. It does not seem to completely stop things from working, though.