I worked very briefly for a company (that I won't name) that did this with elasticsearch. Every customer basically had a customized form for data entry, and eve

I worked very briefly for a company (that I won't name) that did this with elasticsearch. Every customer basically had a customized form for data entry, and every field on that form became a field in ES, even if that same field name and type was on every other form in the system. Eventually they had to contract with another company to run a customized build of ES on a bespoke cluster because they blew past the default 10k limit on the number of fields in ES. When it became clear that they had zero interest in fixing this, I tendered my resignation and quickly found a new gig with sane architectural principals.