Weirdly I still find Solr easier to use then ES. Solrs's bulk import has csv support out of the box instead of converting it to json first and increasing its size and payload a lot. The query DSL is way easier and better documented I find. And it tends not to break all the time between releases. I moved a couple of times from Solr to Es and back again. SOLR comes with a tiny admin that you can just use OOB and use to fire your queries against instead of choosing another frontend, configuring and setting that up etc. I find solr's experience way easier and lower ceremony after all.