Thus, the WikiSuite project moved to Manticore Search (starting in Tiki25). Elasticsearch still works well with Tiki, but the WikiSuite-Elasticsearch package is deprecated.
You can still install with the following command:
sudo apt-get install wikisuite-elasticsearch
But you shouldn't as you will get Elasticsearch Version 6.8.23 (The last branch that was not re-licensed away from Open Source)