How do I print the Relevance ?

Per our pinned post on this support forum, we provide all support through Github. You can file issues at https://github.com/10up/ElasticPress.

The relevance score of each post is part of the JSON object returned by Elasticsearch and can certainly be accessed in the plugin. This filter offers access to the entire Elasticsearch response in WordPress https://10up.github.io/ElasticPress/ep_es_query_results.html

If you have additional issues please feel free to file a Github ticket and we will respond.