Install ElasticSearch on a WordPress website

I need a better product search experience on a WordPress website with WooCommerce. I need help in installing and running ElasticSearch on the server and setting ElasticPress with specific product search configurations (post_type = product, tax_query = taxonomy, etc). I have tried it myself and installed ElasticSearch 6.5.0 on the server. It seems to be running correctly. ElasticPress gives me a warning "Your Elasticsearch version 6.5.0 is above the maximum required Elasticsearch version 6.2. ElasticPress may or may not work properly." When I debug ElasticSearch all of the responses are "Query Response Code: HTTP 400".