Elasticsearch query too many results
ElasticSearch will always return results that match your query, even if the score of those results are poor. Your query for 'facesomeuselesschars' will match anything that has 'face' in it because of your ngrams (e.g. the first four characters of your query will be match multiple tokens in your index).
The rest of the characters in your query will simply lower the score of the returned match, but not prevent it from being returned.
If you want to set a minimum score that a result must reach, you can use the min_score parameter.