"The specific test deployment was multitenant anyway-- you can't account or optimize for what tenants are going to index."

So in other words:

"If your specific use case is supporting 50,000 customers each having around 500 documents and only needing basic text search queries and relevance is not a major concern, RedisLabs Search might give you better performance than ElasticSearch!"

(This is assuming there isn't a different way to configure ElasticSearch to work for this scenario, that gives similar performance.)