Melisearch is another really good one. To be honest, I'm also working on something kind of related in my spare time but by the looks of it, I'm another 4-5 mont

Melisearch is another really good one. To be honest, I'm also working on something kind of related in my spare time but by the looks of it, I'm another 4-5 months away from having a fully operational alpha version to open source. Though it's a slightly different concept - kind of a mixture between document oriented databases(think couchbase, mongo) and elasticsearch. Currently trying to get a half-baked working version that I want to use for another project with a friend of mine and use that in order to test some of the concepts at a larger scale. I opted for rust for a million and one reasons(performance, not dealing with garbage collectors, pleasant to work with) but if we set that aside, I'm with you when it comes to java: even without knowing what it's written in, you can immediately tell that elasticsearch is a product of java. It's incredibly clunky no matter how much resources you give it or now powerful your hardware is. My personal workstation is a dual-14 core xeon with 64gb of ram and even on it it feels like trying to run a demanding game on an old Acer eee with an intel atom CPU. 4 frames per minute if you are lucky. Java is a monster, I completely agree and it's made worse by the convoluted paradigms, syntax and the Frankenstein's monster that is the jvm. Good thing Kotlin came about - at least the syntax is nice.